Generated by All in One SEO Pro v4.9.0, this is an llms-full.txt file, used by LLMs to index the site. # PSM Fasteners Driving for Excellence ## Posts ### [Blog](https://psmfasteners.com/blog/) **Published:** January 18, 2021 **Author:** PSM Fasteners --- ### [Complete Guide to Inserts for Plastics](https://psmfasteners.com/complete-guide-to-inserts-for-plastics/) **Published:** April 10, 2026 **Author:** PSM Fasteners **Excerpt:** The complete guide to inserts for plastics — heat, ultrasonic, press, mould-in, and self-tapping. Choose the right type to prevent pull-out failure and thread strip. **Content:** Choosing the wrong insert for a plastic assembly leads to thread stripping, boss cracking, and costly field failures. This complete guide to inserts for plastics walks you through every installation method, the plastic types they suit, and the critical design parameters that determine long-term joint reliability. ![Complete Guide to Inserts for Plastics](https://psmfasteners.com/wp-content/uploads/2026/04/Complete-Guide-to-Inserts-for-Plastics-1024x572.avif)Thread failure in plastic assemblies rarely happens at random. It happens when the wrong insert for plastics is selected for the material, the installation method, or the load conditions. For manufacturing engineers, that means rework, delays, and — in the worst case — field recalls. Understanding the differences between insert types isn’t just an academic exercise. It’s the decision that separates a reliable, long-running assembly from one that comes back from the field with stripped threads and cracked bosses. This complete guide to inserts for plastics covers the five main installation methods, when to use each one, and the design parameters you need to get right. 🔧 Not Sure Which Insert for Plastics Is Right for Your Application? PSM Fasteners has provided engineered fastening solutions since 1936. Our technical team offers free application consultations — no obligation, just expert guidance tailored to your plastic type, load conditions, and production process. [ Get Free Technical Consultation → ](https://psmfasteners.com/contact-us) ## **Why Choosing the Right Insert for Plastics Determines Assembly Reliability** Not all inserts for plastics behave the same way under load. The two failure modes engineers need to design against are **pull-out** — the insert being forced axially out of the hole — and **torque-out** — the insert rotating within the plastic when the mating fastener is tightened. Your choice of insert type, installation method, and geometry directly affects resistance to both. Getting this wrong doesn’t just mean a failed part — it means understanding why it failed and starting the selection process over, this time under production pressure. The right starting point is **PSM’s** [**inserts for plastics guide**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/), which maps every installation method to application type, plastic grade, and performance requirements. ### **Thermoplastics vs. Thermosets: The First Decision** Before you select an insert type, you need to know what you’re inserting into. Thermoplastics — including ABS, PC, PP, and PEEK — can be re-melted, which makes them compatible with heat and ultrasonic installation methods. The plastic flows around the insert’s knurl pattern and re-solidifies to form a strong mechanical bond. Thermosets — such as epoxy-based composites and vulcanised rubber — are permanently rigid once cured. They cannot be re-melted, so heat-based methods are not suitable. For thermosets, the appropriate inserts for plastics are mould-in, press-fit, or self-tapping types. ### **How Knurl Geometry Affects Pull-Out and Torque Resistance** Knurl design has a direct impact on joint performance. Helical knurls increase axial pull-out resistance — particularly effective at knurl angles between 30° and 45°. Straight knurls offer higher torque resistance but can induce greater stress on surrounding plastic material. Some insert series combine multiple knurl bands at different helix angles to optimise for both failure modes simultaneously. When reviewing manufacturer specification data, always check knurl design alongside overknurl diameter and installed length. ## **Heat-Set Inserts for Plastics: Best for Thermoplastic Precision Applications** Heat-set installation — sometimes called heat-staking — involves heating the insert and pressing it into a pre-moulded hole. As the insert reaches the plastic’s softening point, the thermoplastic flows into the knurl pattern and solidifies on cooling, creating a mechanically locked bond. This method produces excellent pull-out and torque resistance in thermoplastic assemblies. It is well-suited to ABS, PC, and nylon components where controlled installation temperatures can be maintained. The key advantage is that the reflow process consolidates the plastic around the insert, often strengthening the boss area compared to the base material. ### **Choosing the Right Heat-Set Insert for Your Plastic** The **PSM**[ Heat-Lok range**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/heat-lok/) covers heat installation inserts in both standard and headed forms, with stud variants for applications requiring an external thread. Installation temperature must be matched to the specific thermoplastic — too low and the plastic won’t reflow adequately; too high and you risk degradation of the boss material. Boss diameter is a critical parameter. The recommended boss diameter is typically 2–3 times the insert’s overknurl diameter. Undersized bosses will bulge or crack during installation, compromising both appearance and structural integrity. ### **Hole Depth and Jack-Out Prevention** Hole depth must always exceed insert length — the minimum recommendation is insert length plus two thread pitches. If the assembly fastener bottoms out before full clamp load is achieved, jack-out occurs: the insert is forced back out of the hole under the installation load. This is a common cause of insert failure that goes undetected until the joint loosens in service. ## **Ultrasonic Inserts for Plastics: High-Speed Installation for Automated Lines** Ultrasonic installation uses high-frequency vibrations — typically 20–40 kHz — to generate localised heat at the insert-plastic interface. The plastic softens, the insert is driven into the hole, and the joint solidifies when vibration stops. This method is faster than thermal staking once the process is dialled in, and it suits high-volume production lines where cycle time is critical. The trade-off is precision: ultrasonic installation requires careful control of amplitude, pressure, and weld time. Variation in any of these parameters can produce inconsistent bond quality across a production run. ### **Sonic-Lok and Tech-Sonic: Ultrasonic Insert Options** The **PSM** [**Sonic-Lok range**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/sonic-lok/) is designed specifically for ultrasonic installation, available in standard, headed, and stud variants across metric and unified thread sizes. The Tech-Sonic series also supports ultrasonic installation and offers a tapered body design that is self-aligning during insertion — reducing setup time and improving placement consistency on automated press equipment. Tapered inserts are particularly advantageous in high-volume environments because they locate accurately in the hole before the press cycle begins, reducing the likelihood of misaligned installations that generate scrapped parts. ## **Press-Fit Inserts for Plastics: No Heat Required** Press-fit inserts for plastics are installed by applying direct axial force — no heat, no vibration. The insert is pressed into a pre-drilled or moulded hole and the knurl pattern bites into the surrounding plastic under load. This method suits softer thermoplastics and applications where heat or ultrasonic equipment is unavailable. Press-fit installation is fast and straightforward, but produces lower pull-out resistance than heat or ultrasonic methods in most thermoplastics. Boss cracking is a real risk if hole tolerances are not tightly controlled — the hole must not be undersized relative to the insert’s overknurl diameter. ### **Press-Lok and Taper-X for Press Installation** The PSM Press-Lok (PLK) and Taper-X (TX) series both support press installation. The Taper-X is particularly well-suited because its tapered profile provides controlled guidance during insertion and reduces the risk of boss stress concentration at the entry point. For applications requiring press-fit installation into harder plastic grades, the Tri-Step insert — with its three-step press profile — distributes installation load progressively across the boss wall, reducing peak stress on the surrounding material. 💰 Stop Paying the Cost of Failed Inserts for Plastics Thread strip-out, boss cracking, and field returns are expensive — not just in parts, but in production downtime and reputation. PSM Fasteners’ 500+ specialised configurations mean you’re more likely to find the exact insert your application needs, not a compromise. Request a quote and get the right specification the first time. [ Request a Quote → ](https://psmfasteners.com/contact-us) ## **Self-Tapping Inserts for Plastics: Post-Mould Flexibility for Thermosets** Self-tapping inserts for plastics are threaded externally with a thin, coarse-pitched profile designed to cut their own thread as they are driven into a pre-drilled hole. They require no heat and no press tooling — installation is achieved with a standard driver or torque tool. The external thread profile is engineered to minimise hoop stress on the surrounding plastic. The coarse pitch maximises the plastic shear area, which is the primary resistance mechanism against pull-out. As the mating fastener is tightened, the frictional surface between insert and plastic increases — unlike other insert types, torque resistance improves with use rather than degrading. ### **Screw-Sert for Plastics and Thermoset Applications** The PSM [**Screw-Sert range (SCT/HSCT/SCTS)**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/screw-sert/) is designed for self-tapping installation into both thermoplastics and thermosets. The headed variants (HSCT) provide additional bearing area against the surface, improving resistance to joint relaxation under vibration loading. Self-tapping inserts are generally recommended for softer plastic grades. For harder thermoplastics or glass-filled materials, the risk of cracking during installation increases — in those cases, a heat-set or ultrasonic insert for plastics is the more reliable choice. ## **Mould-In Inserts for Plastics: Maximum Performance for High-Stress Applications** Mould-in inserts for plastics are placed into the injection mould tool before the shot is fired. The plastic encapsulates the insert completely during moulding, producing the highest possible pull-out and torque resistance of any installation method. Because the entire insert body — including all undercuts and knurl features — is fully encapsulated, there is no post-mould installation step and no risk of boss damage during assembly. The trade-off is complexity: the mould tool must be designed to locate and retain inserts during each cycle, and cycle times are longer than post-mould methods. ### **Banc-Lok, Fin-Lok, and Flo-Tech for Moulded-In Applications** For injection moulding applications, the PSM [**Banc-Lok and Fin-Lok series**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/banc-lok/) provide reliable mould-in performance across a broad range of thermoplastics. The Flo-Tech (FTC) insert is specifically engineered for injection moulding, with a geometry that promotes complete plastic encapsulation and eliminates voids around the insert body. Mould-in inserts are the preferred choice for high-cycle applications in automotive, medical devices, and electronics — where joint reliability over millions of cycles is non-negotiable and rework is not an acceptable outcome. ## **Key Design Parameters for Inserts for Plastics** Reading a manufacturer’s specification chart correctly is as important as selecting the right insert type. Here are the parameters that matter most when specifying inserts for plastic components. ### **Boss Diameter and Wall Thickness** The boss — the raised plastic section surrounding the insert hole — must have sufficient wall thickness to withstand installation load without bulging or cracking. Design the boss diameter to 2–3 times the insert’s overknurl diameter. If wall thickness cannot be increased, adding radial ribs around the boss distributes installation stress and maintains structural integrity. ### **Installed Length and Hole Depth** Longer inserts for plastics provide greater pull-out resistance. Hole depth must always exceed the installed insert length by at least two thread pitches. This ensures the assembly fastener cannot bottom out and generate jack-out force — one of the most common causes of in-service insert failure. ### **Material Selection: Brass, Stainless Steel, or Nylon** PSM inserts for plastics are available in brass, stainless steel, and nylon depending on the series and application. Brass remains the most widely used — offering a good balance of machinability, corrosion resistance, and thermal conductivity for heat installation. Stainless steel provides higher strength and superior corrosion resistance for harsh environments. For weight-sensitive or electrically isolated applications, the Spiro coiled wire insert range offers a lightweight alternative with excellent torque retention. ## **What PSM Fasteners Offers Engineers** PSM Fasteners has provided specialised inserts for plastics and engineered fastening solutions since 1936, with ISO 9001:2015 certified quality management across 500+ configurations. The range covers every installation method — heat, ultrasonic, press, self-tapping, and mould-in — with metric and unified thread sizes, multiple material options, and stud variants for external thread applications. For applications that fall outside standard configurations, PSM offers [**custom manufactured fastener solutions**](https://psmfasteners.com/product_guide/custom-manufacture) — engineered to your specific material, geometry, and performance requirements. Free technical consultations are available for engineers working through insert selection, boss design, or installation process questions. Contact the team on **+61 2 9026 8383** (7:30am–4:30pm Mon–Fri AEST). ## **Selecting Inserts for Plastics** The right insert for plastics comes down to four factors: your plastic type (thermoplastic or thermoset), your production method (injection moulding, CNC machining, or 3D printing), your load requirements (pull-out force and torque-out resistance), and your available installation equipment. Match these four factors correctly and you will have a reliable joint. Overlook any one of them and you create the conditions for premature failure. PSM’s full range of inserts for plastics covers every combination of these variables — from miniature ultrasonic inserts for electronics PCB assemblies to high-strength mould-in inserts for automotive structural components — all backed by 85+ years of fastening expertise and Australian-based quality control with global shipping. ⭐ ISO 9001:2015 Certified. Trusted for Inserts for Plastics Since 1936. Trusted by engineers across automotive, electronics, medical devices, and renewable energy. PSM Fasteners combines a 500+ configuration specialised range with free technical support — so you get the right insert specified correctly, the first time. [ Work with Certified Experts → ](https://psmfasteners.com/contact-us) Inserts for plastics are not interchangeable. The right type depends on your plastic chemistry, your manufacturing process, your load requirements, and your production environment. Heat-set and ultrasonic inserts deliver the best performance in thermoplastic assemblies where installation equipment is available. Self-tapping and press-fit inserts offer post-mould flexibility where heat is not an option. Mould-in inserts provide maximum joint integrity for demanding, high-cycle applications. ## **Frequently Asked Questions** ### **Can I use heat-set inserts for plastics in glass-filled grades?** Yes, but process parameters need adjustment. Glass-filled grades have higher stiffness and lower ductility than unfilled thermoplastics, which means the plastic reflows less readily around the insert. You may need higher installation temperatures or longer dwell times. Boss cracking is a higher risk in glass-filled materials — tightly controlled hole tolerances and adequate boss diameter are essential. A technical consultation is recommended before committing to production tooling. ### **What causes thread strip-out when using inserts for plastics?** Thread strip-out typically results from one of three causes: pull-out resistance being exceeded by service loads; under-torquing of the mating fastener; or a mismatch between insert length and boss depth. Longer inserts, coarser external thread pitch, and adequate boss wall thickness all improve pull-out performance. If strip-out is occurring in service, review the installed length against the load case and consider upgrading to a Hi-Tork (HT) or mould-in insert. ### **Is ultrasonic or heat-staking better for ABS plastic inserts?** Both methods work well with ABS. Heat-staking is generally more forgiving on process variation and easier to validate for quality-critical applications. Ultrasonic installation is faster at volume and better suited to automated lines, but requires tighter process control. For low-to-medium volume or prototype runs, heat-staking is typically more practical. For high-volume production, ultrasonic installation with validated process parameters offers better cycle efficiency. **Categories:** Uncategorized --- ### [The Complete Engineering Guide to Fastener Selection](https://psmfasteners.com/the-complete-engineering-guide-to-fastener-selection/) **Published:** February 11, 2026 **Author:** PSM Fasteners **Excerpt:** Choosing the right fastener isn’t just about grabbing the nearest bolt. From preventing stainless steel galling to understanding thread engagement depth in aluminum, this engineering guide covers the critical factors that determine fastener performance in automotive and industrial applications. Learn when to use Grade 5 vs Grade 8, how to prevent thread stripping, and why material compatibility matters. **Content:** The fastener selection isn’t just about grabbing the nearest bolt. From preventing stainless steel galling to understanding thread engagement depth in aluminum, this engineering guide covers the critical factors that determine fastener performance in automotive and industrial applications. Learn when to use Grade 5 vs Grade 8, how to prevent thread stripping, and why material compatibility matters. ![The Complete Engineering Guide to Fastener Selection](https://psmfasteners.com/wp-content/uploads/2026/02/The-Complete-Engineering-Guide-to-Fastener-Selection-1-1024x572.avif)Every engineer has faced it: stripped threads in an aluminum housing, a galled stainless bolt that won’t budge, or fasteners that loosen under vibration despite proper torque. These failures aren’t random—they’re the result of improper fastener selection. Whether you’re mounting a turbocharger to an exhaust manifold or assembling medical device enclosures, understanding fastener fundamentals prevents costly field failures and production delays. ## **Why Material Compatibility Determines Fastener Longevity** The biggest misconception in fastener selection? That stainless steel prevents all corrosion problems. While stainless resists rust, it creates a more serious issue: galling. When stainless fasteners contact stainless or softer metals under high torque, the surfaces cold-weld together. This isn’t just difficult to remove—it often destroys both the fastener and the threaded hole. ### **Galvanic Corrosion Between Dissimilar Metals** Pairing incompatible metals accelerates corrosion through galvanic action. A stainless bolt in an aluminum engine block creates an electrochemical cell where aluminum becomes the anode and corrodes rapidly. The galvanic series shows which metal combinations cause problems: stainless steel and aluminum sit far apart, making them incompatible without protective barriers. For automotive applications in salt-exposed environments, zinc-flake coated Grade 8 bolts with aluminum-based anti-seize outperform bare stainless. The coating prevents direct metal contact while the anti-seize blocks moisture intrusion. This combination provides corrosion resistance without galling risk. ### **Thread Engagement Depth: Steel vs Aluminum vs Cast Iron** Thread engagement requirements vary dramatically by base material. Steel-to-steel connections need approximately one bolt diameter of thread engagement for full strength. Aluminum requires twice that—two diameters minimum—because of its lower shear strength. Cast iron falls between these extremes at roughly 1.5 diameters. Insufficient engagement causes thread stripping under load, especially during thermal cycling. An M10 bolt needs 10mm engagement in steel, but 20mm in aluminum. Many engine failures traced to “weak fasteners” actually result from inadequate thread depth in the softer material. For applications where sufficient engagement depth isn’t possible, [**inserts for plastics and threaded fasteners**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/) provide reinforced threads in soft materials. 🔧 Not Sure Which Fastener Material Fits Your Application? Material compatibility affects assembly reliability, corrosion resistance, and long-term performance. Our engineering team provides **free technical consultations** to help you select the right fastener materials for your specific application—no obligation required. [Get Free Technical Consultation →](https://psmfasteners.com/contact-us) ## **Understanding Bolt Grades: When Higher Isn’t Always Better** Grade markings on bolt heads indicate tensile strength, but selecting the highest grade causes problems in specific applications. Grade 8 bolts (150 ksi tensile strength) seem superior to Grade 5 (120 ksi), yet Grade 8’s brittleness creates failure risks under impact or cyclic loading. ### **Grade 5 vs Grade 8: The Toughness Trade-off** Higher grade fasteners achieve strength through heat treatment, which increases hardness but reduces ductility. Grade 8 bolts fail suddenly with little warning—they snap rather than bend. Grade 5 bolts yield visibly before fracturing, providing a safety margin in critical applications. For structural automotive connections experiencing vibration and shock loads, Grade 5 often outlasts Grade 8. The ductility absorbs impact energy that would crack a brittle Grade 8 fastener. Performance engine builders frequently use Grade 8 for static high-load applications (main bearing caps) while specifying Grade 5 for dynamic loads (suspension components). ### **Hydrogen Embrittlement in High-Strength Fasteners** Grade 12.9 metric fasteners and Grade 8 imperial bolts risk hydrogen embrittlement during electroplating. Hydrogen atoms absorbed during coating penetrate the crystalline structure, causing delayed fracture under load. This explains bolts that pass installation torque but fail days later. Proper baking cycles after plating drive out absorbed hydrogen, but quality varies by manufacturer. ISO 9001:2015 certified suppliers follow controlled processes that minimize embrittlement risk. For critical applications, specify fasteners with documented heat treatment and plating procedures. ## **Thread Types: Coarse vs Fine Thread Selection** Thread pitch affects assembly strength, cross-threading resistance, and vibration loosening. Coarse threads (fewer threads per inch) provide faster assembly and better tolerance for dirty or damaged threads. Fine threads offer superior vibration resistance and more precise torque control. ### **When to Use Coarse Thread Fasteners** Coarse threads excel in applications requiring frequent disassembly or where thread damage is likely. The larger thread profile resists cross-threading during installation and maintains clamping force even with minor thread damage. For tapping into softer materials like aluminum or plastics, coarse threads create stronger engagement with less material displacement. Automotive assembly lines prefer coarse threads because they assemble quickly and tolerate slight misalignment. The larger pitch also works better with pneumatic tools that lack precise torque control. When working with [**thread-forming screws for plastics**](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-flange-phillips-stainless-steel-wn1411ka30x12ss/), coarse threads reduce material stress and cracking risk. ### **Fine Thread Applications and Advantages** Fine threads generate more clamping force per unit of applied torque due to their mechanical advantage. The smaller pitch creates more thread engagement area within the same length, distributing loads across more material. This makes fine threads ideal for high-vibration environments where loosening is a concern. Aerospace and performance automotive applications specify fine threads for precision torque requirements. An M10x1.25 fine thread bolt achieves the same clamping force as M10x1.5 coarse at lower torque, reducing overtightening risk in thin materials. For applications where thread depth is limited, fine threads maximize engagement within available space. ## **Installation Methods and Clamping Force Optimization** Proper installation technique matters as much as fastener selection. Achieving correct clamping force requires understanding the relationship between torque, friction, and bolt stretch. Approximately 90% of applied torque overcomes friction—only 10% actually stretches the bolt to create clamping force. ### **Anti-Seize and Thread Locking Compounds** Anti-seize compounds prevent galling and corrosion but dramatically affect torque-tension relationships. Aluminum-based anti-seize reduces friction by 30-40%, meaning standard torque specs will overtighten treated fasteners. When using anti-seize, reduce torque by 25-30% or consult manufacturer specifications for treated fastener torque values. Copper-based anti-seize provides excellent lubricity and high-temperature resistance but accelerates galvanic corrosion between dissimilar metals. Never use copper anti-seize on aluminum components or with zinc-plated fasteners. Nickel-based formulations prevent galling on stainless without galvanic corrosion concerns. Thread locking compounds like Loctite provide vibration resistance without the friction reduction of anti-seize. Purple (low-strength) Loctite allows easy disassembly while preventing loosening—ideal for automotive applications requiring periodic maintenance. Red (high-strength) Loctite creates permanent assemblies requiring heat for removal. ### **Alternatives to Direct Tapping: Inserts and Self-Clinching Fasteners** Thin materials and soft substrates often can’t support reliable threaded connections. Rather than tapping threads directly into 1mm sheet metal or reinforced plastics, [**self-clinching nuts and sheet metal fasteners**](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/) create permanent, reusable threads. These fasteners install by pressing into a pre-punched hole, displacing material to form a mechanical lock. [**Anchor rivet bushes for sheet metal**](https://psmfasteners.com/product/sheet-metal-anchor-rivet-bushes-m3-012-2-0-2-2-b-arbm3012b/) provide flush-mount threaded connections without access to the back side. The installation process expands the fastener, creating a strong mechanical interlock with material as thin as 0.5mm. This eliminates welding and maintains clean aesthetics while supporting repeated assembly cycles. For plastic assemblies requiring precise standoff heights, [**compression limiters for controlled clamping**](https://psmfasteners.com/product_guide/compression-limiters-captive-bolt-assemblies-guide/) prevent over-compression damage. These hollow fasteners absorb clamping force, protecting brittle materials while maintaining dimensional accuracy across thermal expansion cycles. 💰 Prevent Costly Production Delays and Field Failures Poor fastener selection causes thread stripping, assembly line stoppages, and warranty claims. Get **transparent pricing on engineered fastener solutions** that prevent failures before they happen. Our application engineers help you avoid expensive rework and downtime. [Request a Quote →](https://psmfasteners.com/contact-us) ## **What PSM Fasteners Does Differently in Fastener Engineering** Generic hardware store fasteners work for basic applications, but engineered fastening systems require specialized solutions. PSM Fasteners provides comprehensive fastener engineering support backed by ISO 9001:2015 certified quality management and 85+ years of experience across automotive, medical device, electronics, and renewable energy sectors. ### **Custom Manufactured Solutions for Specialized Applications** Standard catalog fasteners don’t address every design challenge. When your application requires non-standard materials, specialized coatings, or unique geometries, [**custom manufactured fastener solutions**](https://psmfasteners.com/product_guide/custom-manufacture) deliver exactly what your assembly needs. Our engineering team works from your specifications or collaborates on design optimization to create fasteners that match your performance requirements. Custom manufacturing addresses problems like limited installation access, extreme temperature cycling, or compatibility with proprietary materials. Rather than compromising your design around available fasteners, engineered solutions integrate seamlessly with your assembly process and meet your exact mechanical requirements. ### **Technical Support Throughout Product Development** Selecting fasteners during initial design prevents expensive changes later. Our application engineers review your assembly requirements, recommend appropriate fastener types, and provide installation guidance before you commit to tooling. This front-end consultation prevents common mistakes like insufficient thread engagement, incompatible material pairings, or inadequate vibration resistance. We supply technical specifications for proper installation procedures, including torque values adjusted for anti-seize application, press-fit force requirements for self-clinching fasteners, and ultrasonic welding parameters for thermoplastic inserts. This documentation supports your quality control procedures and ensures consistent assembly across production runs. ## **Preventing Common Fastener Failures in Automotive Applications** Automotive environments combine the worst fastener challenges: vibration, thermal cycling, corrosion exposure, and dissimilar material interfaces. Understanding failure modes helps specify fasteners that survive these conditions. ### **Vibration Loosening and Locking Methods** Vibration causes fasteners to loosen through micro-movements that gradually reduce clamping force. Standard nuts on smooth bolts lose preload even when initially torqued correctly. Locking mechanisms prevent rotation through mechanical interference (lock washers, nylon inserts) or chemical bonding (thread lockers). Nylon insert lock nuts (Nylock) provide reusable vibration resistance up to approximately 120°C. Above this temperature, nylon softens and loses effectiveness—common in exhaust and turbocharger applications. For high-temperature applications, all-metal prevailing-torque nuts or mechanical locking features maintain preload. Thread locking compounds like Loctite cure in the absence of oxygen, filling the clearance between male and female threads. This prevents the micro-movement that causes loosening while allowing controlled disassembly with hand tools (low-strength) or heat (high-strength formulations). ### **Thermal Expansion Mismatch Between Materials** When fastening materials with different thermal expansion coefficients, temperature changes create cyclic stress. An aluminum exhaust manifold expands more than the steel bolts holding it, causing tension increases during heating and loosening during cooling. This cycling eventually fatigues the fastener or damages the threads. Selecting fastener materials with expansion rates closer to the base material reduces thermal stress. For aluminum components operating at elevated temperatures, aluminum fasteners eliminate expansion mismatch—though their lower strength requires larger sizes. Alternatively, designing the joint to accommodate thermal movement through slotted holes or spring washers maintains clamping force across temperature cycles. ⭐ ISO 9001:2015 Certified Manufacturing Quality PSM Fasteners delivers **certified quality across 500+ specialized fastener configurations** with comprehensive technical support. From automotive to medical device applications, our 85+ years of engineering expertise ensures your fasteners meet exacting performance standards and regulatory requirements. [Work with Certified Experts →](https://psmfasteners.com/contact-us) ## **Getting Fastener Selection Right From the Start** Fastener failures rarely announce themselves during assembly. Thread stripping appears weeks later during service. Galling reveals itself only during disassembly. Vibration loosening causes catastrophic failures without warning. Preventing these problems requires understanding how material compatibility, thread engagement, grade selection, and installation methods interact. The difference between reliable assemblies and field failures often comes down to details: using aluminum anti-seize instead of copper on dissimilar metals, specifying two diameters of thread engagement in aluminum, or selecting Grade 5 over Grade 8 for impact loads. These decisions seem minor during design but determine whether your product succeeds in service. Whether you’re designing new assemblies or troubleshooting existing failures, partnering with fastener specialists who understand these engineering fundamentals prevents costly mistakes and ensures your fastening systems perform as intended across their entire service life. ## **Frequently Asked Questions About Fastener Selection** ### **Should I use stainless steel fasteners to prevent corrosion?** Not always. Stainless steel fasteners gall easily when threaded into stainless or softer metals like aluminum. For corrosion resistance without galling risk, use zinc-flake coated Grade 8 bolts with appropriate anti-seize. Reserve stainless for low-torque, non-structural applications or marine environments where galvanic isolation is maintained. ### **How much thread engagement do I need in aluminum?** Aluminum requires approximately two bolt diameters of thread engagement for full strength—twice the requirement for steel. An M8 bolt needs 16mm of thread depth in aluminum versus 8mm in steel. When sufficient depth isn’t available, use threaded inserts to reinforce the threads. ### **When should I use Grade 8 bolts instead of Grade 5?** Use Grade 8 for static high-load applications where maximum tensile strength is required and space limits larger fasteners. Choose Grade 5 for dynamic loads involving vibration, shock, or impact where ductility prevents brittle failure. Never substitute grades without verifying torque specifications—Grade 8 requires higher torque to achieve proper preload. ### **What’s the difference between coarse and fine thread?** Coarse threads assemble faster, resist cross-threading, and work better in soft materials. Fine threads provide superior vibration resistance, more precise torque control, and greater tensile strength in the same diameter. Most automotive applications use coarse threads except where vibration loosening or space limitations favor fine threads. ### **How does anti-seize affect torque specifications?** Anti-seize reduces friction by 30-40%, meaning standard torque values will overtighten treated fasteners. Reduce torque by 25-30% when using anti-seize unless manufacturer specifications account for lubricated threads. Never mix anti-seize types—copper accelerates galvanic corrosion on aluminum while aluminum-based formulations remain electrically conductive. **Categories:** Spring Steel and Plastic Fasteners **Tags:** spring steel --- ### [Fastener Material Selection Guide 2026](https://psmfasteners.com/fastener-material-selection-guide/) **Published:** February 19, 2026 **Author:** PSM Fasteners **Excerpt:** Selecting the wrong fastener material can lead to costly corrosion failures, production delays, and product recalls. Learn the 8 critical factors engineers consider when choosing fastener materials for corrosive environments, high-temperature applications, and challenging assemblies. **Content:** Wrong fastener material selection can lead to costly corrosion failures, production delays, and product recalls. Learn the 8 critical factors engineers consider when choosing fastener materials for corrosive environments, high-temperature applications, and challenging assemblies. ![Fastener Material Selection Guide 2026](https://psmfasteners.com/wp-content/uploads/2026/02/Fastener-Material-Selection-Guide-2026-v2-1024x572.avif)Choosing the wrong fastener material creates a cascade of problems: corroded assemblies that won’t disassemble during maintenance, production line shutdowns, warranty claims, and product recalls. With hundreds of fastener materials available, how do you select the right one for your specific application? The answer lies in understanding eight critical factors that determine fastener material performance. Whether you’re designing automotive components, medical devices, or industrial equipment, proper fastener material selection directly impacts assembly reliability, maintenance costs, and product longevity. 🔧 Experiencing Corrosion or Material Compatibility Issues? Our fastening specialists provide **free technical consultations** to help you select the optimal fastener material for your specific application and environment. No obligation, just expert guidance. [Get Free Technical Consultation →](https://psmfasteners.com/contact-us) ## **Understanding Material Compatibility in Fastener Applications** The most common fastener failure mode isn’t mechanical overload—it’s corrosion-related degradation. Engineers who prioritize initial cost savings by selecting plated mild steel fasteners often face significantly higher expenses when those fasteners corrode and prevent disassembly during routine maintenance. ### **The True Cost of Corrosion in Fastener Assemblies** When a corroded fastener seizes in place, costs extend beyond replacement parts. Production lines stop. Maintenance crews spend hours attempting removal. In worst cases, the entire assembly becomes scrap because the fastener cannot be removed without damaging surrounding components. **Consider this scenario:** A facility chose zinc-plated steel fasteners to save $2,000 on an initial production run. Two years later, severe corrosion prevented fastener removal. The resulting downtime, emergency repairs, and component replacement cost $47,000. This happens repeatedly because material compatibility isn’t properly understood during design. ### **Galvanic Corrosion: The Silent Assembly Destroyer** Galvanic corrosion occurs when dissimilar metals contact each other in the presence of an electrolyte—even humid air or rainwater. This creates a battery effect where current flows between metals, accelerating corrosion of the more anodic (less noble) material. The critical insight: the fastener should always be more corrosion-resistant than the base material. Why? Because the fastener is the key to joint integrity. Corrosion affecting the base material may be tolerable, but a corroded fastener compromises the entire assembly’s structural integrity. Stainless steel [**thread forming screws for plastics**](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-flange-phillips-stainless-steel-wn1411ka30x12ss/) demonstrate this principle. When fastening plastic components outdoors or in humid environments, stainless steel provides inherent corrosion resistance that eliminates rust staining or degradation. ## **Metal Fastener Materials: Corrosion Resistance and Strength Considerations** Metal fasteners dominate industrial applications due to superior strength, temperature resistance, and mechanical properties. However, selecting the wrong metal for your environment creates reliability problems that compound over time. ### **Stainless Steel vs. Plated Fasteners** Mild steel fasteners with zinc or galvanized coatings represent the traditional low-cost option. These perform adequately indoors with controlled humidity. However, the coating is consumable. Once it wears through from assembly friction or environmental exposure, the underlying steel corrodes rapidly. Stainless steel fasteners cost more initially but provide inherent corrosion resistance throughout the material’s entire cross-section. No coating to wear through. For outdoor applications, marine environments, or chemical exposure, stainless steel represents inexpensive insurance against field failures. The cost differential appears more significant than it is. Upgrading from zinc-plated to stainless steel typically increases finished product price by less than 0.5%. That minimal increase eliminates corrosion risk while improving perceived quality. ### **Brass and Bronze for Specialized Applications** Brass fasteners excel where electrical conductivity is required or stainless steel might cause galvanic concerns. [**FIN-LOK brass inserts**](https://psmfasteners.com/product/inserts-for-plastics-m5-x-9-5-fin-lok-brass-psm05790-flbm5/) provide excellent corrosion resistance in plastic assemblies while offering superior electrical conductivity compared to stainless steel. Bronze fasteners offer even greater corrosion resistance in marine and harsh chemical environments. However, bronze’s lower strength means engineers must carefully evaluate load requirements for structural applications. ### **Understanding Material Pairing** When different metals contact each other, their position in the galvanic series determines which material experiences accelerated corrosion. Materials closer together create less galvanic potential and less corrosion risk. Key pairings to avoid: aluminum base materials with steel fasteners in wet environments cause rapid aluminum corrosion. Steel base materials with stainless steel fasteners generally perform well. Zinc-plated fasteners with aluminum work temporarily, but zinc coating consumption accelerates. 💰 Stop Wasting Money on Corrosion-Related Failures Prevent costly production downtime and warranty claims by selecting **corrosion-resistant fastener materials** from the start. Get transparent pricing on stainless steel, brass, and specialized alloy fasteners. [Request a Quote →](https://psmfasteners.com/contact-us) ## **Plastic Fastener Materials: When to Choose Non-Metallic Solutions** Plastic fasteners solve specific engineering challenges where metal creates problems: electrical insulation requirements, weight reduction mandates, chemical exposure concerns, or situations where metal would cause galvanic corrosion. ### **Nylon: The Versatile Lightweight Alternative** Nylon offers the best overall balance for general-purpose plastic fastener applications. With good mechanical strength, impact resistance, and temperature stability to approximately 85°C, nylon works well in automotive interiors, consumer electronics, and light industrial equipment. Primary limitations include poor UV resistance, limited chemical resistance to acids and strong alkalines, and relatively low heat resistance. For outdoor or chemically aggressive environments, consider alternative plastics with better environmental resistance. ### **PVDF: Chemical and Electrical Applications** Polyvinylidene fluoride (PVDF) fasteners excel in electrical cabinets and chemically aggressive environments. With excellent resistance to acids, alkalines, and most solvents, PVDF maintains mechanical properties where nylon would rapidly degrade. PVDF’s temperature stability, heat resistance, and flame resistance make it ideal for electrical applications where safety standards prohibit materials that contribute to fire propagation. [**Ultrasonic installation inserts**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/tech-sonic/) manufactured from brass install into PVDF housings without thermal degradation, creating strong threaded connections in chemically resistant assemblies. ### **PEEK for Extreme Environments** Polyetheretherketone (PEEK) represents the premium plastic fastener option. With continuous operating temperatures to 180°C, excellent chemical resistance, high tensile strength, and good flame resistance, PEEK serves oil and gas, aerospace, and high-temperature industrial applications. Material cost for PEEK exceeds other engineering plastics significantly, but for sustained high-temperature performance combined with mechanical strength, PEEK often represents the only viable plastic option. [**Heat installation inserts**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/heat-lok/) work exceptionally well with PEEK materials, creating strong metal threads in high-performance plastic assemblies. ## **Installation Method Impact on Fastener Material Selection** Installation method directly influences which fastener materials perform optimally. Heat installation, ultrasonic installation, and cold press-fit each impose different thermal and mechanical stresses. ### **Heat Installation Considerations** Heat installation requires fasteners that withstand insertion temperatures of 200-350°C without degradation. Brass inserts handle these temperatures while providing excellent thermal conductivity for rapid heat transfer during installation. Base material must also tolerate these temperatures. Thermoplastics like polypropylene, nylon, and polycarbonate work well with heat installation, while thermosetting plastics require alternative methods to prevent thermal damage. ### **Ultrasonic Installation Requirements** Ultrasonic installation generates localized heating through high-frequency vibration, melting plastic around the insert while leaving surrounding material unaffected. [**SONIC-LOK inserts for softer plastics**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/sonic-lok/) feature knurled or grooved external surfaces that create optimal mechanical bonding with melted plastic. This method works best with thermoplastics having well-defined melting points. Amorphous plastics and thermosetting materials generally don’t respond well because they don’t melt and reflow like crystalline thermoplastics. ### **Cold Press-Fit Advantages** [**PRESS-LOK brass inserts**](https://psmfasteners.com/product/inserts-for-plastics-m6-x-12-7-press-lok-brass-psm01729-plkbm6/) eliminate thermal stress entirely by using mechanical interference and undercut features. This cold installation works with virtually any plastic material, including thermosetting plastics, filled composites, and thermally sensitive materials that can’t tolerate heat or ultrasonic installation. The trade-off involves higher installation forces and accurately molded or drilled holes to ensure proper press-fit interference. However, for maximum material compatibility or where thermal installation would degrade material properties, press-fit offers an excellent solution. ## **Industry-Specific Material Requirements** Different industries impose specific requirements based on regulatory standards, environmental conditions, and performance expectations. ### **Automotive and Manufacturing** Automotive fasteners must withstand vibration, temperature cycling, and exposure to oils, fuels, and road salt. Stainless steel fasteners with mechanical locking features prevent loosening in high-vibration environments. For non-structural applications, lightweight nylon fasteners reduce vehicle weight while providing adequate strength for interior trim and electrical components. ### **Pharmaceutical and Medical Devices** Pharmaceutical equipment and medical devices demand materials that won’t contaminate products or patients. Stainless steel grades 304 and 316 provide corrosion resistance and cleanability required for pharmaceutical manufacturing. These withstand repeated cleaning with aggressive sanitizers without degrading. Medical device assemblies often specify polypropylene (PP) fasteners for excellent chemical resistance and sterilization compatibility. PP’s resistance to chemicals combined with autoclave capability makes it ideal for reusable medical instruments. ### **Oil and Gas Extreme Environments** Oil and gas applications expose fasteners to extreme temperatures, high pressures, corrosive chemicals, and continuous vibration. PEEK fasteners operate continuously at temperatures to 180°C while resisting crude oil, natural gas, drilling fluids, and harsh chemicals. For structural applications requiring metal, exotic alloys like Inconel, Hastelloy, or duplex stainless steels provide necessary corrosion resistance and mechanical properties for subsea equipment, refinery piping, and offshore platforms. ⭐ ISO 9001:2015 Certified Quality You Can Trust PSM Fasteners provides **85+ years of fastening expertise** with certified quality management and custom engineering support. Work with Australia’s trusted fastener specialists. [Start Your Project Today →](https://psmfasteners.com/contact-us) ## **What PSM Fasteners Does Differently in Material Selection Support** Selecting optimal fastener materials requires more than comparing property charts. It demands understanding complete application context: assembly method, environmental exposure, regulatory requirements, maintenance considerations, and cost constraints. ### **ISO 9001:2015 Certified Quality Management** PSM Fasteners maintains ISO 9001:2015 certification, ensuring every fastener meets documented quality standards through verified manufacturing processes. Material specifications are rigorously controlled, providing consistent performance batch after batch. For engineers in regulated industries like medical devices or automotive manufacturing, ISO certification provides documented quality assurance required to meet compliance mandates. ### **Custom Engineering and Application Support** Not every fastening challenge fits standard catalog products. PSM Fasteners offers [**custom manufactured fastener solutions**](https://psmfasteners.com/product_guide/custom-manufacture) engineered specifically for unique material requirements, dimensional constraints, or performance specifications. This custom capability means engineers can specify exactly the right material without compromising design requirements. Whether you need specialized alloys, unique coatings, or non-standard dimensions, custom manufacturing ensures optimal fastener material selection without forcing design compromises. ## **Material Selection Summary** Fastener material selection determines whether your assembly performs reliably throughout its intended lifecycle or fails prematurely due to corrosion, material incompatibility, or environmental degradation. The eight critical factors—corrosion resistance, galvanic compatibility, strength requirements, temperature stability, chemical resistance, installation method, industry standards, and environmental considerations—provide a systematic evaluation framework. The cost difference between adequate and optimal fastener materials rarely exceeds 1% of total product cost. However, that small investment prevents field failures, warranty claims, production delays, and costly maintenance interventions that can cost hundreds or thousands of times the initial fastener savings. Ready to select the right fastener material for your application? [**Explore our fastener product range**](https://psmfasteners.com/product-search/) or contact PSM Fasteners at +61 2 9026 8383 (7:30am – 4:30pm Mon-Fri AEST) for expert guidance on material selection, custom solutions, and technical specifications. ## **Frequently Asked Questions About Fastener Material Selection** ### **How do I prevent galvanic corrosion between dissimilar metals?** Select fastener materials more noble (corrosion-resistant) than the base material, or use isolation methods like non-conductive washers or coatings. Stainless steel fasteners generally perform well with aluminum, steel, and brass base materials when properly designed. ### **What’s the difference between stainless steel grades for fasteners?** Grade 304 stainless provides excellent general-purpose corrosion resistance for most indoor and outdoor applications. Grade 316 stainless offers superior resistance to chlorides and marine environments. For specific applications, consult material compatibility charts or contact fastening specialists. ### **Can I use plastic fasteners for structural applications?** PEEK and high-performance nylon grades offer significant strength suitable for semi-structural applications. However, metal fasteners generally provide superior strength, stiffness, and creep resistance for primary structural connections. Evaluate load requirements carefully when considering plastic fasteners. ### **How do installation methods affect fastener material choices?** Heat installation requires materials withstanding 200-350°C without degradation. Ultrasonic installation works best with thermoplastics having defined melting points. Press-fit installation accommodates virtually any material but requires specific dimensional tolerances and hole preparation. ### **What material should I choose for high-temperature applications?** For metal fasteners, stainless steel maintains strength to approximately 400°C, while exotic alloys like Inconel serve even higher temperatures. For plastic fasteners, PEEK operates continuously to 180°C, while standard nylon and polypropylene limit around 85-100°C maximum. **Categories:** Fasteners for Special Materials **Tags:** fasteners for special materials --- ### [Assembly Efficiency with PSM's Direct Screw Fixings](https://psmfasteners.com/direct-screw-fixings-plastics-assembly/) **Published:** November 16, 2024 **Author:** PSM Fasteners **Excerpt:** PSM’s direct screw fixings, including the renowned PT® Screw range, deliver a fast and economical solution for assembling plastic and light alloy components. **Content:** PSM’s [direct screw fixings](https://www.rgafasteners-psm.com/ "direct screw fixings"), including the renowned PT® Screw range, deliver a fast and economical solution for assembling plastic and light alloy components. Stop damaging plastics during assembly—PSM’s direct screw fixings deliver. ![Assembly Efficiency with PSM’s Direct Screw Fixings](https://psmfasteners.com/wp-content/uploads/2024/11/Assembly-Efficiency-with-PSMs-Direct-Screw-Fixings-1024x572.avif) Fastening plastics, composites, and engineered materials presents unique challenges that traditional screws simply can’t solve. Thread stripping, boss cracking, and inconsistent pull-out resistance plague manufacturers who rely on standard fasteners for non-metallic assemblies. These failures lead to costly rework, production delays, and field failures that damage your reputation. PSM’s direct screw fixings eliminate these problems. Engineered specifically for plastics and special materials, these fasteners deliver reliable performance without damaging delicate substrates. Whether you’re working with reinforced composites in aerospace or engineered plastics in medical devices, understanding when and how to use direct screw fixings can transform your assembly efficiency. 🔧 Experiencing Thread Stripping or Boss Cracking in Plastic Assemblies? Our fastening engineers provide **free technical consultations** to help you select the right direct screw fixing for your material and application. No obligation—just expert guidance. [Get Free Technical Consultation →](https://psmfasteners.com/contact-us) ## Why Standard Fasteners Fail in Plastics and Composites Using conventional machine screws or self-tapping screws in plastics often results in assembly failures. These materials behave differently under stress compared to metals, requiring specialized fastening approaches. ### The Hidden Costs of Fastener Failure When fasteners fail in plastic assemblies, the consequences extend beyond the immediate repair. Production lines stop while engineers troubleshoot root causes. Quality teams increase inspection frequency, slowing throughput. Warranty claims pile up as field failures emerge months after product launch. Each failure represents wasted material, labor, and customer trust. Direct screw fixings address these issues by distributing load more effectively and engaging with plastic material properties rather than fighting against them. The result is consistent, repeatable fastening performance across production runs. ### Material-Specific Challenges Different plastics exhibit unique behaviors during fastening. Thermoplastics like ABS and polycarbonate can deform under excessive torque, creating loose joints that fail under vibration. Reinforced composites require careful thread engagement to avoid delamination. Brittle engineering plastics crack when standard screws create excessive radial stress during installation. PSM’s [**direct screw fixings for plastics and light alloys**](https://psmfasteners.com/product_guide/direct-screw-fixings-for-plastics-light-alloys-guide) are engineered to accommodate these material characteristics. Thread geometry, pitch, and installation torque specifications are optimized for each substrate type. ## What Makes Direct Screw Fixings Ideal for Plastics PT screws and specialized direct screw fixings differ fundamentally from standard fasteners. Their design focuses on creating secure, damage-free connections in materials with lower hardness and different failure modes than metals. ### Thread Geometry and Engagement The thread profile of direct screw fixings features wider spacing and shallower depth compared to machine screws. This design reduces stress concentration in the plastic boss while maintaining high pull-out resistance. The threads cut into the material during installation, forming a precise fit that resists loosening under vibration. Thread-forming variants displace material rather than cutting it, creating even stronger engagement without generating debris. This approach works particularly well in semi-crystalline plastics like nylon and acetal, where displaced material maintains molecular structure integrity. ### High Pull-Out Resistance Without Boss Damage Pull-out resistance measures the axial force required to remove a fastener from its threaded hole. Direct screw fixings achieve pull-out values comparable to threaded inserts while requiring simpler installation. The secret lies in optimized thread engagement length and geometry that distributes stress across a larger surface area. Testing shows that properly installed PT screws in reinforced nylon can withstand pull-out forces exceeding 800N without permanent boss deformation. This performance level meets requirements for automotive under-hood applications and aerospace interior assemblies where vibration and thermal cycling are constant concerns. ### Installation Speed and Cost Efficiency Unlike threaded inserts that require ultrasonic or heat installation equipment, direct screw fixings install with standard powered screwdrivers. This simplicity reduces capital equipment costs and eliminates the quality variables associated with insert installation. No temperature monitoring, no energy director design, no post-installation inspection for insert seating depth. Assembly time per fastener drops from 8-12 seconds (typical for ultrasonic inserts) to 2-4 seconds with direct screw fixings. For high-volume production, this efficiency gain translates to significant labor cost savings and increased line capacity. ## Material Compatibility: Composites, Alloys, and Engineered Plastics Not all plastics accept direct screw fixings equally well. Understanding material compatibility prevents selection errors that lead to field failures. ### Thermoplastic Performance Unreinforced thermoplastics like polypropylene and polyethylene offer limited thread engagement strength. Direct screw fixings work in these materials for low-load applications, but engineers should consider glass-filled or mineral-filled variants for structural joints. The reinforcement fibers provide mechanical anchoring that significantly improves pull-out resistance. ABS and polycarbonate blends represent the sweet spot for direct screw fixing performance. These materials offer good creep resistance and maintain thread engagement under sustained loads. Medical device enclosures, consumer electronics housings, and automotive interior trim components frequently use these materials with PT screws. ### Composite and Hybrid Structures Fiber-reinforced composites present unique fastening challenges. The anisotropic nature of these materials means strength varies with fiber orientation. Carbon fiber and fiberglass laminates require careful boss design and fastener selection to prevent delamination during installation and service loads. PSM’s **[fasteners for special materials](https://psmfasteners.com/understanding-psms-fasteners-for-special-materials)** include options specifically engineered for composite substrates. These fasteners feature modified thread profiles and installation torque specifications that account for the material’s layered structure. ### Light Alloy Applications Magnesium and aluminum alloys also benefit from direct screw fixing technology. While these materials are metals, their relatively soft nature creates similar challenges to engineering plastics. Thread stripping and galling occur when using standard steel fasteners without proper thread engagement design. Direct screw fixings for light alloys use thread-forming technology that cold-works the material during installation, creating stronger threads than those cut by traditional taps. This approach eliminates the need for threaded inserts in many applications, simplifying assembly and reducing component costs. 💰 Stop Wasting Money on Assembly Line Downtime Fastener failures cost manufacturers thousands in rework and production delays. Get **transparent pricing on direct screw fixings** engineered to eliminate these failures and improve your bottom line. [Request Custom Pricing →](https://psmfasteners.com/contact-us) ## Direct Screw Fixings vs. Threaded Inserts: When to Choose Each Both direct screw fixings and threaded inserts solve plastic fastening problems, but each excels in different scenarios. Understanding the tradeoffs helps engineers select the optimal solution. ### Installation Method Comparison [**Threaded brass inserts for plastics**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/sonic-lok) require ultrasonic or heat installation. This process creates a permanent threaded boss that accepts standard machine screws. The advantage is reusability—you can remove and reinstall screws multiple times without degrading the threads. Medical devices and aerospace components that require field serviceability benefit from this capability. Direct screw fixings install directly into molded or drilled holes using torque-controlled drivers. Installation is faster and requires less specialized equipment, but most direct screw designs aren’t meant for repeated removal. For permanent assemblies or products with minimal service requirements, this limitation poses no problem. [**Heat-Lok inserts for amorphous thermoplastics**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/heat-lok) offer a middle ground. They install quickly using heated installation tools and provide reusable threads. However, heat installation introduces thermal stress that can warp thin-walled bosses or create cosmetic defects near the insertion point. ### Cost Analysis: Total Assembly Economics Equipment investment differs significantly between approaches. Ultrasonic insertion requires capital equipment ranging from $5,000 to $25,000 depending on automation level. Heat installation tools cost less but still represent a $2,000-$8,000 investment. Direct screw fixings work with existing powered screwdrivers, eliminating specialized equipment costs. Per-fastener material costs also vary. Brass inserts typically cost 3-5 times more than equivalent direct screw fixings. For high-volume production, this difference multiplies across millions of assemblies. A consumer electronics product using 20 fasteners per unit and producing 500,000 units annually could save $200,000-$400,000 by switching from inserts to direct screw fixings where reusability isn’t required. ### Load Requirements and Durability Threaded inserts generally provide higher pull-out resistance than direct screw fixings in the same material. The metal insert distributes load across a larger engagement area and doesn’t rely on plastic threads to carry the full load. For high-stress applications like automotive suspension components or aerospace structural mounts, inserts often represent the safer choice. Direct screw fixings excel in moderate-load applications where pull-out forces stay below 1000N. Consumer electronics, medical device enclosures, industrial control panels, and automotive interior trim fit this category. The key is matching fastener selection to actual service loads rather than over-engineering for worst-case scenarios that rarely occur. ## Choosing the Right Direct Screw Fixing for Your Application Application-specific selection criteria ensure optimal performance. Generic fastener selection often leads to over-specification or under-performance. ### Boss Design Considerations The plastic boss must provide adequate material for thread engagement. As a general rule, boss outer diameter should be at least 2.5 times the screw major diameter to prevent wall splitting during installation. Thread engagement length should equal 1.5-2.0 times the screw diameter for optimal pull-out resistance without excessive installation torque. Boss wall thickness affects stress distribution during screw installation. Thicker walls resist radial expansion better but require higher installation torque. Engineers must balance these factors against molding limitations and material availability. PSM’s technical team can review boss designs during the prototype phase to identify potential issues before tooling investment. ### Torque Specifications and Process Control Each material and screw combination has an optimal installation torque range. Too little torque creates loose joints that fail under vibration. Excessive torque strips threads or cracks bosses. Torque-controlled assembly tools with programmable settings ensure consistent installation across production runs. For critical applications, implementing torque monitoring with automatic reject systems prevents defective assemblies from reaching customers. The investment in process control pays for itself by eliminating field failures and warranty claims. ### Material Specification and Testing Not all plastics with the same generic name perform identically. A polycarbonate from one resin supplier may have different creep resistance than another supplier’s material. Glass fiber content, molecular weight, and processing conditions all affect fastening performance. Prototype testing with actual production materials validates fastener selection before high-volume production begins. Pull-out testing, cyclic loading, and environmental exposure help identify potential issues. [**Explore our product catalog**](https://psmfasteners.com/product-search) to find fasteners matched to your specific material and load requirements. ## How PSM’s Engineering Support Optimizes Assembly Efficiency Technical expertise separates successful fastening solutions from problematic ones. PSM’s engineering support helps customers avoid costly mistakes and optimize designs for manufacturability. ### Design Validation and Performance Testing Before committing to production tooling, engineers can work with PSM’s technical team to validate fastener selection. This collaboration includes finite element analysis of stress distribution, physical testing of prototype assemblies, and recommendations for boss geometry optimization. Testing services include pull-out force measurement, torque-angle analysis, vibration resistance evaluation, and environmental exposure studies. Data from these tests informs design revisions and provides documentation for quality management systems. ### Custom Fastener Development Standard catalog products solve most fastening challenges, but some applications demand [**custom fastener solutions**](https://psmfasteners.com/product-guide). PSM’s manufacturing capabilities enable modifications to thread profile, head style, material specification, and coating selection. Custom development follows a structured process from initial consultation through prototype delivery and production scaling. Lead times vary based on complexity, but typical custom fastener projects complete within 8-12 weeks from specification approval to first article delivery. ### ISO 9001:2015 Certified Quality PSM maintains ISO 9001:2015 certification for quality management systems. This certification demonstrates commitment to consistent product quality, traceability, and continuous improvement. For customers in regulated industries like medical devices and aerospace, ISO certification simplifies supplier qualification and audit requirements. Quality documentation includes material certifications, dimensional inspection reports, and performance test data. This transparency helps manufacturers maintain their own quality systems and respond to customer audits efficiently. ## Industries Benefiting from Direct Screw Fixings Diverse sectors rely on PSM’s direct screw fixings to solve material-specific fastening challenges. Understanding industry applications helps engineers recognize parallels to their own problems. ### Aerospace: Lightweight Structural Efficiency Aircraft interior components increasingly use carbon fiber composites and reinforced thermoplastics to reduce weight. Every kilogram saved in cabin components translates to fuel savings over the aircraft’s service life. Direct screw fixings enable lighter assembly designs by eliminating metal inserts while maintaining structural integrity. Aerospace applications also demand vibration resistance and environmental durability. Direct screw fixings with thread-locking features prevent loosening during flight cycles while resisting humidity, temperature extremes, and chemical exposure from cleaning agents. ### Automotive: High-Volume Production Reliability Automotive manufacturers produce millions of vehicles annually, making assembly efficiency critical. Direct screw fixings reduce cycle time and equipment costs while delivering the reliability required for components exposed to vibration, thermal cycling, and environmental stress. Under-hood applications present additional challenges from elevated temperatures and chemical exposure. PSM’s material selection and coating options ensure direct screw fixings maintain performance throughout vehicle service life. Visit our [**industries we serve**](https://psmfasteners.com/different-industries) page to explore automotive-specific solutions. ### Electronics: Precision Assembly at Scale Consumer electronics and industrial control systems require precise assembly tolerances and damage-free fastening. Plastic enclosures house sensitive electronic components that can’t tolerate assembly stress or electromagnetic interference from conductive fasteners. Direct screw fixings made from non-conductive materials eliminate EMI concerns while providing secure attachment. Thread designs optimized for thin-walled bosses prevent warping that would affect sealing gaskets or alignment features. ### Medical Devices: Regulatory Compliance and Performance Medical device manufacturers face strict regulatory requirements for material biocompatibility, traceability, and quality control. PSM’s documentation capabilities and material certifications support FDA submissions and ISO 13485 compliance. Direct screw fixings in medical applications must withstand repeated sterilization cycles without degradation. Material selection focuses on chemical resistance and dimensional stability under autoclave conditions. Performance testing validates fastener integrity after multiple sterilization cycles. ## Related Fastening Solutions for Hybrid Assemblies Many products combine multiple materials in a single assembly. Understanding the full range of fastening options helps engineers optimize overall design. ### Spring Steel and Plastic Component Integration Products that mix stamped metal parts with plastic housings require fastening solutions that accommodate both materials. [**Spring steel and plastic fasteners**](https://psmfasteners.com/product_guide/spring-steel-plastic-fasteners-guide) provide options for joining dissimilar materials without compromising either substrate. Push-fit and snap-fit fasteners eliminate threaded connections entirely for some applications. These solutions reduce assembly time and component count while maintaining adequate retention force for non-structural joints. ### Thread Locking for Critical Assemblies Even properly installed direct screw fixings can loosen under severe vibration if thread locking isn’t addressed. Nylon patches, chemical threadlockers, and mechanical locking features prevent loosening without requiring additional components or assembly steps. PSM offers direct screw fixings with integrated thread locking through Nyltite, Nyplas, and Nyseal technologies. These treatments add minimal cost while significantly improving vibration resistance in demanding applications. ⭐ Trusted by Engineers Across Automotive, Aerospace & Medical Device Sectors With **ISO 9001:2015 certification** and over 85 years of fastening expertise, PSM delivers reliable solutions backed by comprehensive engineering support. Get the quality your project demands. [Start Your Project Today →](https://psmfasteners.com/contact-us) ## Enhance Your Assembly Efficiency Today Direct screw fixings deliver reliable fastening performance in plastics, composites, and special materials where standard fasteners fail. By eliminating thread stripping, boss cracking, and installation complexity, these specialized fasteners reduce assembly costs while improving product quality. PSM’s 85+ years of fastening expertise helps engineers select optimal solutions for their specific materials and applications. From initial design consultation through production support, our ISO 9001:2015 certified quality systems ensure consistent performance across millions of assemblies. ## Frequently Asked Questions About Direct Screw Fixings ### What’s the difference between PT screws and standard self-tapping screws? PT screws feature thread geometry specifically engineered for plastics, with wider spacing and optimized engagement depth. Standard self-tapping screws designed for sheet metal create excessive radial stress in plastics, leading to boss cracking and poor pull-out resistance. PT screws distribute stress more evenly and require lower installation torque. ### Can direct screw fixings be removed and reinstalled? Most direct screw fixings are designed for permanent installation. Removing and reinstalling them degrades thread engagement and reduces pull-out resistance. For applications requiring repeated assembly, threaded inserts provide better reusability. However, some direct screw fixing designs allow limited removal cycles for service access. ### How do I calculate the correct boss size for my application? Boss outer diameter should be at least 2.5 times the screw’s major diameter to prevent wall splitting. Thread engagement length should equal 1.5-2.0 times screw diameter for optimal pull-out resistance. PSM’s engineering team can review your specific design and provide recommendations based on material type and load requirements. ### What installation torque should I use for plastics? Installation torque varies by material, screw size, and boss design. Glass-filled nylon typically accepts higher torque than unreinforced thermoplastics. PSM provides torque specifications for each fastener and material combination. Using torque-controlled assembly tools ensures consistent installation and prevents thread stripping or boss damage. ### Do direct screw fixings work in composites and carbon fiber? Yes, but boss design and installation technique require careful attention. Composite materials are anisotropic, meaning strength varies with fiber orientation. Thread engagement must account for potential delamination during installation. PSM offers direct screw fixings specifically engineered for composite substrates with modified thread profiles and installation specifications. **Categories:** Direct Screw Fixings For Plastics & Light Alloys **Tags:** direct screw fixings --- ### [Best Spring Steel and Plastic Fasteners in the Market](https://psmfasteners.com/best-spring-steel-and-plastic-fasteners-guide/) **Published:** January 5, 2025 **Author:** PSM Fasteners **Excerpt:** When it comes to fastening solutions that deliver reliability, flexibility, and efficiency, spring steel and plastic fasteners from PSM stand out as trusted choices for manufacturers worldwide. Designed to meet the evolving demands of modern industries, these components provide tailored solutions that combine strength, versatility, and cost-effectiveness across automotive, electronics, appliance, and industrial equipment applications. **Content:** Explore spring steel and plastic fasteners benefits for automotive, electronics & industrial use. Custom solutions from PSM Fasteners. ![Best Spring Steel and Plastic Fasteners in the Market](https://psmfasteners.com/wp-content/uploads/2025/01/Best-Spring-Steel-and-Plastic-Fasteners-in-the-Market-1024x572.avif)When a fastener fails in an automotive panel or an electronics enclosure, the consequences go far beyond a loose component. You’re looking at production delays, warranty claims, and costly rework that could have been prevented at the design stage. Spring steel and plastic fasteners are engineered specifically to prevent these failures. Whether you’re securing automotive interior trim under constant vibration or assembling lightweight electronics housings that demand electrical insulation, choosing the right fastener type determines whether your product performs reliably or creates problems in the field. This guide covers how both fastener types work, where each one excels, and how to select the right solution for your application — with insights from PSM’s **[spring steel and plastic fasteners guide](https://psmfasteners.com/product_guide/spring-steel-plastic-fasteners-guide),** developed over nine decades of fastening expertise. ⚙️ Not Sure Which Fastener is Right for Your Application? Our application engineers provide **free technical consultations** on fastener selection, material compatibility, and installation methods. ISO 9001:2015 certified quality across 500+ specialized configurations. [ Get Free Technical Consultation → ](https://psmfasteners.com/contact-us) ## Why Fastener Choice Directly Impacts Assembly Performance ### The Real Cost of the Wrong Fastener Selecting the wrong fastener type doesn’t just create an assembly challenge — it creates a downstream failure chain. Thread stripping during installation, vibration-induced loosening in service, and corrosion-related seizure during maintenance are all consequences of mismatched fastener selection. For manufacturing engineers managing production lines, these failures translate directly into scrap rates, line stoppages, and field warranty costs. In high-volume automotive or appliance production, even a 0.5% fastener failure rate can generate significant financial exposure across thousands of units. ### Spring Steel vs. Plastic: Understanding the Fundamental Difference Spring steel fasteners use elastic deformation to generate clamping force and retention. Plastic fasteners rely on material properties — low density, chemical inertness, and electrical non-conductivity — to solve different engineering problems. Neither is universally superior. The optimal choice depends on your load requirements, environmental conditions, material substrate, and assembly process. In many modern assemblies, both types are used together — spring steel for structural retention and plastic for insulation or weight reduction. ## Spring Steel Fastener Benefits: Where Metal Resilience Matters ### Vibration Resistance Across Demanding Environments Spring steel fasteners maintain clamping force under dynamic loads that would cause standard fasteners to loosen progressively. Their elastic properties allow them to absorb vibration energy rather than transmit it through the joint, which is why they’re the preferred choice for automotive chassis, engine compartments, and industrial machinery. Products like [cage nuts for vibration-prone assemblies](https://psmfasteners.com/product_guide/spring-steel-plastic-fasteners-guide/cage-nuts/) allow a captive nut to float slightly within its cage, compensating for misalignment while the spring steel cage maintains retention against vibration and shock. This combination of flexibility and grip is difficult to replicate with rigid fastener types. ### High-Stress Retention Without Secondary Operations One of the most significant production advantages of spring steel fasteners is tool-free or minimal-tool installation. U-nuts, J-clips, and spring latches snap into position without threading operations, reducing assembly time by up to 50% compared to conventional threaded fasteners. For [edge clips for panel assemblies](https://psmfasteners.com/product_guide/spring-steel-plastic-fasteners-guide/edge-clips/), installation requires nothing more than pressing the clip over abutting panel edges. The spring barbs engage both panels simultaneously, creating a vibration-resistant joint without welding, tapping, or adhesives. In high-volume appliance or automotive interior trim production, this efficiency compounds significantly across thousands of assemblies per shift. ### Material and Coating Compatibility for Harsh Conditions Spring steel fasteners used with plastic substrates require careful coating selection to prevent corrosion and minimize stress on the mating plastic. Zinc, phosphate, and galvanised finishes protect the steel while providing surfaces that won’t abrade or contaminate adjacent plastic components. High-carbon and oil-quenched spring steel grades maintain their elastic properties through heat cycling and repeated loading — critical in automotive applications where thermal expansion cycles occur thousands of times over a vehicle’s service life. ## Plastic Fastener Benefits: Solving Problems Metal Cannot ### Weight Reduction Without Compromising Retention In automotive and aerospace applications, every gram of weight reduction contributes to fuel efficiency and emissions compliance. Plastic fasteners offer comparable retention strength to many metal alternatives at a fraction of the weight, making them increasingly specified in door panels, dashboard assemblies, instrument clusters, and interior trim. For electronics manufacturers, lightweight plastic fasteners also simplify handling during automated assembly, reducing pick-and-place cycle times and minimizing the risk of component damage during installation. ### Electrical Insulation That Protects Circuit Integrity In electronics enclosures, PCB mounts, and power distribution assemblies, unintended electrical conductivity through a metal fastener can cause short circuits, grounding faults, or EMI interference. Plastic fasteners eliminate this risk entirely. This is particularly valuable in high-density electronics where components are in close proximity and where any conductive path between assemblies could compromise product safety or regulatory compliance. Combined with [direct screw fixings for plastics](https://psmfasteners.com/product_guide/direct-screw-fixings-for-plastics-light-alloys-guide), plastic fasteners support efficient assembly directly into thermoplastic substrates without pre-installed inserts. ### Corrosion and Chemical Resistance for Demanding Environments Metal fasteners in chemical processing, marine, or outdoor environments require expensive coatings or stainless steel grades to resist corrosion. Plastic fasteners are inherently resistant to moisture, many acids, alkalis, and solvents — without additional surface treatment. In appliance assemblies exposed to cleaning chemicals, and in industrial equipment operating in humid or corrosive environments, plastic fasteners provide long-term reliability that coated metal alternatives struggle to match over extended service life. 💰 Stop Wasting Money on Failed Fasteners Poor fastener selection causes thread stripping, assembly line stoppages, and costly warranty claims. Get **transparent pricing on engineered fastener solutions** that prevent failures before they happen. Our application engineers help you avoid expensive rework and downtime. [ Request a Quote → ](https://psmfasteners.com/contact-us) ## Selecting the Right Fastener: Key Decision Criteria ### Matching Fastener Type to Substrate and Load Requirements The starting point for any fastener selection is the substrate material. Spring steel fasteners perform optimally in metal panel assemblies, hybrid metal-plastic structures, and applications where the spring action itself generates retention force. Plastic fasteners are specified when the substrate is thermoplastic, when weight matters, or when electrical isolation is required. Load type also matters significantly. Spring steel handles dynamic and vibration loads well due to its elastic properties. For static clamping loads in plastic housings, consulting the [fastener material selection guide](https://psmfasteners.com/fastener-material-selection-guide/) helps engineers avoid material mismatches that lead to creep, stress cracking, or galvanic corrosion over time. ### Surface Treatment and Environmental Compatibility Surface finish decisions affect long-term performance more than many engineers anticipate during initial design. Zinc-plated spring steel is suitable for indoor environments with moderate humidity. Stainless steel grades or advanced coatings are required for marine, outdoor, or chemically aggressive environments. For assemblies combining spring steel and plastic components, coating selection must consider thermal expansion differentials and chemical compatibility between the coating and the adjacent polymer. PSM’s engineering team routinely supports customers in navigating these material pairing decisions as part of pre-production validation. ### When Special Materials Demand Specialized Solutions Some substrates — magnesium alloys, thermoset composites, zinc die-castings, and FR-4 circuit boards — present fastening challenges that neither standard spring steel nor general-purpose plastic fasteners can address alone. [**Fasteners for special materials**](https://psmfasteners.com/product_guide/fasteners-for-special-materials-guide/) are engineered specifically for these substrates, providing hardened threads or precision retention in materials that would otherwise strip, crack, or deform under standard fastener installation forces. ## What Sets PSM Fasteners Apart for Custom Applications ### ISO 9001:2015 Quality Across 500+ Configurations PSM’s ISO 9001:2015 certified quality management system governs every stage of production — from raw material sourcing through finished component inspection. With over 500 specialized fastener configurations, the PSM range covers the breadth of spring steel and plastic fastener requirements without compromising on dimensional consistency or material traceability. For manufacturers supplying into automotive, medical device, or electronics sectors where component traceability and quality documentation are mandatory, PSM’s certification provides the assurance your supply chain requires. ### Custom Engineering Support from Concept to Production Standard catalogue fasteners solve most applications. When they don’t, PSM’s engineering team develops custom solutions through specialized materials and protective finishes, custom shapes and sizes matched to your assembly geometry, precision-molded inserts, clips, clamps, and retainers, and design validation with pre-production testing through PSM’s Technology Centre. This end-to-end support model means you’re not simply purchasing components — you’re engaging engineering expertise that reduces your development risk and accelerates time to production. ### 85+ Years Serving Automotive, Electronics, and Industrial Sectors Since 1936, PSM has developed fastening solutions for the industries that demand the most from their components. Automotive manufacturers rely on PSM’s vibration-resistant spring steel products for interior trim and chassis applications. Electronics manufacturers specify PSM’s plastic and insulating fasteners for PCB assemblies and enclosures. Industrial equipment builders depend on PSM’s heavy-duty spring steel configurations for equipment that operates in continuous high-vibration environments. This depth of application experience — combined with global distribution from Australia — means PSM understands your engineering context before the first technical conversation begins. ⭐ Trusted by Engineers Across Automotive, Electronics & Industrial Sectors PSM Fasteners brings **ISO 9001:2015 certified quality**, 85+ years of fastening expertise, and custom engineering support to every project. From single-component consultations to full production runs, we deliver solutions backed by rigorous quality assurance and global distribution. [ Start Your Project Today → ](https://psmfasteners.com/contact-us) ## Thread Locking, Anti-Rattle, and Noise Reduction Considerations ### When Vibration Management Extends Beyond the Fastener Itself In automotive and industrial applications, vibration management is not always solved by the fastener alone. Anti-rattle washers, belt clips, and cable trunking fixings made from spring steel or plastic play a supporting role in eliminating noise and movement that standard fasteners don’t address. PSM’s spring steel range includes solutions engineered specifically for noise reduction in automotive interiors — where panel rattles and squeaks are a significant quality concern for vehicle manufacturers. The non-metallic properties of plastic fasteners similarly contribute to vibration damping in appliance housings and electronics enclosures where acoustic performance matters. ### Combining Spring Steel and Plastic for Optimal Assembly Performance Many modern assemblies benefit from a hybrid approach — spring steel for structural load-bearing joints and plastic for insulating, lightweight, or chemically resistant connections within the same product. This combination requires careful material pairing to avoid galvanic corrosion at contact points and to ensure that thermal expansion differentials don’t generate stress at the fastener interface. The **[complete engineering guide to fastener selection](https://psmfasteners.com/the-complete-engineering-guide-to-fastener-selection/)** provides detailed decision frameworks for engineers navigating these multi-material assembly challenges. ## The Right Fastener Starts with the Right Partner Choosing between spring steel and plastic fasteners — or combining both — is a decision that pays dividends across the entire product lifecycle. The right selection reduces assembly time, prevents field failures, supports regulatory compliance, and eliminates costly rework. PSM Fasteners has delivered these outcomes for manufacturers across automotive, electronics, appliances, and industrial equipment since 1936. With ISO 9001:2015 certification, a 500+ configuration product range, and engineering teams ready to support custom development, PSM is positioned to solve your most demanding fastening challenges. Don’t let fastener selection become a problem you discover after production begins. Contact PSM today at **+61 2 9026 8383** (7:30am – 4:30pm Mon-Fri AEST) or **[request a quote online](https://psmfasteners.com/contact-us/)** to start the conversation. ## Frequently Asked Questions About Spring Steel and Plastic Fasteners ### What is the main advantage of spring steel fasteners over standard metal fasteners? Spring steel fasteners use elastic deformation to generate and maintain clamping force. Unlike rigid fasteners that can loosen under vibration, spring steel components absorb dynamic loads and maintain retention — making them significantly more reliable in automotive, industrial, and high-vibration applications. ### When should I specify plastic fasteners instead of metal? Plastic fasteners are the right choice when weight reduction, electrical insulation, or corrosion resistance are primary requirements. They are commonly specified in electronics PCB assemblies, automotive interior trim, and chemical or marine environments where metal fasteners would corrode or create grounding risks. ### Can spring steel and plastic fasteners be used together in the same assembly? Yes, and this is common practice in modern lightweight assemblies. Spring steel handles structural retention and vibration-prone joints, while plastic fasteners manage insulation, weight, and corrosion-sensitive connections. Careful material pairing is required to prevent galvanic corrosion at contact points between metal and plastic components. ### How does PSM support custom fastener development? PSM’s engineering team works with customers from initial design through pre-production testing. This includes custom shapes and sizes, specialized material and finish specifications, and validation testing through PSM’s Technology Centre — ensuring the final fastener meets both performance and production requirements before full-scale manufacturing begins. ### What industries does PSM supply spring steel and plastic fasteners to? PSM supplies fastening solutions to automotive, electronics, appliance, and industrial equipment manufacturers globally. Applications range from automotive interior trim and chassis assemblies through to PCB mounting, consumer electronics enclosures, and heavy industrial equipment operating in continuous high-vibration environments. **Categories:** Spring Steel and Plastic Fasteners **Tags:** fasteners, Plastic Fasteners, PSM --- ### [PSM’s Fasteners for Special Materials](https://psmfasteners.com/psm-fasteners-special-materials-guide/) **Published:** January 5, 2025 **Author:** PSM Fasteners **Excerpt:** Not all fastening challenges can be solved with standard components. Learn how PSM's fasteners for special materials deliver reliable performance in composites, engineered plastics, and advanced alloys where conventional fasteners fall short. **Content:** Not all fastening challenges can be solved with standard components. Learn how PSM’s fasteners for special materials deliver reliable performance in composites, engineered plastics, and advanced alloys where conventional fasteners fall short. Standard fasteners fail in composites. Here’s what works instead. ![PSM’s Fasteners for Special Materials](https://psmfasteners.com/wp-content/uploads/2025/01/PSMs-Fasteners-for-Special-Materials-1-1024x572.avif)Standard fasteners work perfectly—until they don’t. When manufacturing engineers encounter advanced composites, engineered plastics, or specialty alloys, conventional fastening methods often cause delamination, cracking, or catastrophic assembly failures. These materials demand specialized solutions that address unique substrate properties without compromising strength or durability. PSM Fasteners has spent 85+ years developing fastening technologies specifically engineered for materials where off-the-shelf components fall short. ## Why Special Materials Demand Specialized Fastening Solutions Special materials present challenges that standard fasteners simply cannot address. Carbon fiber composites crack under compression loads. Engineered plastics creep under sustained stress. Dissimilar metals create galvanic corrosion that weakens assemblies over time. ### The Hidden Costs of Using Standard Fasteners on Special Materials Manufacturing engineers who attempt to use standard fasteners on advanced materials frequently encounter expensive problems. Delamination in composite layups occurs when excessive clamping forces separate bonded layers. Thread stripping in softer substrates like PEEK or nylon leads to failed pull-out tests and rejected parts. Material damage during installation creates stress concentrations that propagate into cracks during thermal cycling. These failures don’t just affect individual components. Assembly line shutdowns cost manufacturers thousands per hour. Field failures trigger warranty claims and product recalls. Design iterations extend time-to-market for new products. The true cost of incompatible fasteners extends far beyond the price of replacement parts. ### Material Compatibility Requirements Engineers Must Consider Different substrate categories require fundamentally different fastening approaches. Thermoplastic materials like polycarbonate and ABS respond well to heat or ultrasonic installation but can creep under constant loads. Thermoset composites like carbon fiber epoxy provide excellent strength but crack easily during drilling or compression. Metal alloys ranging from aluminum to titanium each have unique galvanic compatibility requirements. Temperature sensitivity also plays a critical role. Some plastics degrade above 150°C, eliminating heat-staking as an installation option. Others remain stable to 260°C but require specific torque specifications to prevent compression failure. Understanding these material behaviors determines which fastening technology will succeed. 🔧 Experiencing Fastener Failures in Composites or Engineered Plastics? Our fastening engineers provide **free technical consultations** to help you select the right fastener technology for your specific material and application. No obligation—just expert guidance from specialists who understand advanced substrates. [ Get Free Technical Consultation → ](https://psmfasteners.com/contact-us) ## Types of Fasteners for Special Materials PSM offers specialized fastening technologies designed specifically for substrates beyond traditional sheet metal applications. Each solution addresses distinct material properties and installation requirements. ### Threaded Inserts for Plastics and Composites [**Threaded brass inserts for plastics**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/sonic-lok) create strong, reusable metal threads in substrates that cannot support direct screw installation. These inserts distribute loads across a larger surface area, preventing the pull-through failures common with self-tapping screws. Installation methods include ultrasonic, heat-staking, and press-in designs depending on material type. Brass construction offers excellent corrosion resistance and prevents galvanic reactions with aluminum or steel components. Knurled or undercut external profiles provide mechanical retention that resists torque-out during assembly and field service. Thread sizes range from M2 to M10, accommodating applications from consumer electronics to automotive assemblies. ### Direct Screw Fixings for Engineered Plastics [**Thread-forming PT screws for engineered plastics**](https://psmfasteners.com/product-search) offer a simpler alternative when reusability isn’t required. These specialized screws cut precise threads during installation, creating intimate contact between screw threads and plastic substrate. The result is pull-out resistance that often exceeds that of molded-in bosses. PT screws work exceptionally well in semi-crystalline plastics like nylon, acetal, and polypropylene. Their trilobular thread profile creates material flow rather than cutting, reducing internal stress. This makes them ideal for high-volume assembly where installation speed and cost efficiency matter. ### Specialized Fasteners for Composites and Hybrid Materials Carbon fiber, fiberglass, and aramid composites require fasteners that minimize compression damage while maintaining clamp load. [**Spring steel and plastic fasteners**](https://psmfasteners.com/product_guide/spring-steel-plastic-fasteners-guide) provide this combination through designs that accommodate thermal expansion mismatches and vibration loads. Composite-specific fasteners often incorporate features like enlarged bearing areas to distribute clamping forces. Some designs use bonded bushings that become integral to the laminate structure. Others employ floating attachments that permit differential thermal expansion between dissimilar materials without creating destructive stresses. ## How Installation Method Impacts Material Compatibility The installation process itself can make or break fastener performance in special materials. Choosing the wrong method causes material damage that undermines the entire assembly. ### Ultrasonic vs Heat Installation for Thermoplastics Each excel with different plastic families. Ultrasonic installation works best with amorphous plastics like polycarbonate, ABS, and polysulfone. High-frequency vibration generates localized melting at the insert interface without affecting surrounding material. Installation completes in under two seconds with minimal thermal impact. Heat-staking suits semi-crystalline plastics including nylon, acetal, and polypropylene. Controlled temperature application allows the insert to displace molten plastic, which then solidifies around knurled retention features. While slower than ultrasonic methods, heat installation accommodates filled plastics and glass-reinforced compounds that resist vibration welding. ### Press-In and Self-Clinching Technologies Press-in inserts require only mechanical force, eliminating thermal concerns entirely. These designs use interference fits and mechanical retention features to achieve permanent installation. They work well in filled plastics, thermoset composites, and materials sensitive to heat or vibration. Self-clinching fasteners extend this concept to thin-gauge special alloys. The fastener displaces base material into an undercut profile during installation, creating a strong mechanical interlock. This technology excels in aluminum, brass, and stainless steel sheets too thin for conventional tapping. 💰 Stop Wasting Money on Field Failures and Production Rework Choosing the right fastener the first time prevents costly assembly failures, warranty claims, and production delays. Our **custom engineering team** helps you avoid expensive mistakes with material-specific testing and validation before full-scale production. [ Request Custom Engineering Support → ](https://psmfasteners.com/contact-us) ## What PSM Fasteners Does Differently in Custom Solutions Not every fastening challenge fits within standard product catalogs. PSM’s [**custom-engineered fastening solutions**](https://psmfasteners.com/product-guide) address unique requirements through collaborative engineering and rigorous testing. ### ISO 9001:2015 Certified Design and Manufacturing PSM operates under **[ISO 9001:2015 certified quality management](https://psmfasteners.com/about-us/)** systems that ensure consistent performance across custom and standard products. Every fastener undergoes dimensional verification, material certification, and functional testing before shipment. This quality framework supports applications in regulated industries including medical devices, aerospace, and automotive manufacturing. Custom projects receive dedicated engineering support from initial concept through production validation. Engineers analyze load requirements, material compatibility, installation constraints, and environmental factors. Computer modeling predicts fastener performance under operational stresses. Physical prototypes undergo pull-out testing, torque analysis, and accelerated life cycling. ### Technical Consultation and Application Engineering PSM’s engineering team brings 85+ years of collective fastening expertise to every project. They’ve solved fastening challenges across hundreds of material combinations and thousands of unique applications. This experience translates into faster problem-solving and more reliable solutions. Application engineering services include material selection guidance, installation method recommendations, and assembly process optimization. Engineers identify potential failure modes before they occur. They suggest design modifications that improve fastener performance or reduce installation costs. The result is fastening systems optimized for both performance and manufacturability. ## Direct Screw Fixings vs Threaded Inserts: When to Use Each Choosing between direct screw installation and threaded inserts depends on several application factors. Understanding these distinctions prevents over-engineering or under-specifying fastener solutions. ### Reusability and Serviceability Requirements Threaded inserts excel when assemblies require repeated disassembly for maintenance, upgrades, or repairs. The metal insert threads withstand dozens or hundreds of screw insertions without degradation. This makes them essential for consumer electronics, industrial equipment, and any application expecting field service. Direct screw fixings work well in permanent assemblies where disassembly is rare or unnecessary. Single-use consumer products, sealed enclosures, and disposable medical devices often benefit from the cost savings and installation speed of direct screwing. The trade-off is reduced reusability and higher risk of thread stripping during any required disassembly. ### Load Distribution and Pull-Out Strength Inserts distribute pull-out loads across larger contact areas than direct screws. The insert’s external knurling or undercuts engage significantly more substrate material than screw threads alone. This advantage becomes critical in thin-wall plastics or low-density foams where pull-through resistance is limited. PT screws can match insert performance in thicker, higher-density substrates. Their thread-forming action creates intimate contact along the entire thread engagement length. In semi-crystalline plastics with good flow properties, properly designed PT screws achieve pull-out strengths comparable to pressed-in inserts. ## Industries That Demand Specialized Material Fasteners Certain industry sectors routinely encounter materials that challenge conventional fastening approaches. These applications drive innovation in specialized fastener technologies. ### Aerospace and Composite Structures Aerospace manufacturers increasingly use carbon fiber composites to reduce weight while maintaining structural strength. These materials provide exceptional stiffness-to-weight ratios but crack easily under compression loads from standard fasteners. Specialized aerospace fasteners incorporate features like enlarged footprints, bonded bushings, and torque-limiting designs. Lightning strike protection adds another layer of complexity. Composite structures require conductive pathways through fastener installations to dissipate electrical energy. PSM’s [**fastening solutions across automotive, aerospace, electronics, and medical sectors**](https://psmfasteners.com/different-industries) address these multi-faceted requirements through material selection and design optimization. ### Medical Device Manufacturing and Biocompatible Materials Medical devices often use specialized polymers like PEEK, PPSU, and medical-grade silicones that resist sterilization processes. These materials must maintain dimensional stability through repeated autoclaving cycles while meeting stringent biocompatibility standards. Fasteners for medical applications require material certifications, cleanroom manufacturing, and traceability documentation. Implantable devices face even stricter requirements. Fasteners must use biocompatible alloys like titanium or 316L stainless steel. Surface treatments cannot introduce cytotoxic compounds. Thread locking solutions must remain stable in bodily fluids for years or decades. PSM’s medical-grade fasteners meet these demanding specifications. ### Automotive Electrification and Battery Assembly Electric vehicle batteries combine aluminum housings, copper bus bars, polymer separators, and composite structural components. Each material has different thermal expansion coefficients, electrical conductivity requirements, and mechanical properties. Fastening systems must accommodate these differences while maintaining electrical isolation or conductivity as needed. Battery pack assemblies also face severe vibration loads from road conditions and thermal cycling from charge-discharge cycles. Fasteners must resist loosening under these conditions without requiring excessive torque that damages plastic components. Thread-locking compounds and mechanical locking features address these challenges. ⭐ Trusted by Engineers Across Automotive, Medical Device, and Aerospace Industries PSM’s **ISO 9001:2015 certified manufacturing** and 85+ years of fastening expertise ensure reliable performance in the most demanding applications. From prototype development to full-scale production, we deliver quality you can trust. [ Start Your Custom Project Today → ](https://psmfasteners.com/contact-us) ## Fastening Solutions for Flexible and Hybrid Materials Some applications require fasteners that accommodate movement, flexing, or combinations of rigid and compliant materials. Standard rigid fasteners create stress concentrations that lead to premature failure in these scenarios. ### Spring Clips and Retention Fasteners Spring-based fasteners provide secure retention while permitting controlled movement. These designs use elastic deformation to maintain clamping force across thermal expansion ranges or vibration loads. Applications include panel retention in automotive interiors, electronics enclosure assembly, and HVAC ductwork connections. Material selection for spring fasteners balances corrosion resistance with spring properties. Stainless steel provides excellent environmental resistance. Beryllium copper offers superior spring characteristics but requires surface plating. Music wire delivers the highest fatigue life for high-cycle applications. ### Push-In and Snap-Fit Technologies Push-in fasteners eliminate installation tools entirely, reducing assembly time and labor costs. These designs use interference fits, cantilever beams, or ball-and-socket mechanisms to create secure attachments. They work particularly well in trim panels, cable management, and applications where tool access is limited. Successful snap-fit design requires careful analysis of material properties and geometry. Insertion forces must remain within operator capability without requiring excessive effort. Retention forces must resist operational loads while permitting disassembly when needed. PSM’s engineering team optimizes these parameters for each application. ## Preventing Galvanic Corrosion in Multi-Material Assemblies When dissimilar metals contact each other in the presence of an electrolyte, galvanic corrosion accelerates material degradation. This electrochemical process can destroy assemblies within months in harsh environments. ### Material Selection for Corrosion Resistance Choosing fastener materials with compatible galvanic potentials minimizes corrosion risk. Stainless steel fasteners work well with aluminum substrates when properly isolated. Brass inserts pair safely with most plastics and composites. Titanium offers the broadest compatibility but at higher material costs. Coating systems provide another protection layer. Zinc plating protects steel fasteners in moderate environments. Electroless nickel offers superior corrosion resistance for marine or chemical exposure. Some applications require passivation treatments or specialized conversion coatings. ### Isolation Techniques and Barrier Materials Physical isolation prevents direct metal-to-metal contact. Nylon washers, rubber grommets, and plastic sleeves interrupt the electrical path between dissimilar metals. These simple solutions dramatically extend assembly life in corrosive environments. Sealants and encapsulants provide additional protection by excluding moisture and contaminants from fastener interfaces. Anaerobic thread sealants cure in the absence of oxygen, filling gaps in threaded connections. Silicone potting compounds seal entire assemblies against environmental intrusion. ## Conclusion: Choosing the Right Fastener for Your Special Material Special materials demand specialized fastening solutions. Off-the-shelf fasteners that work perfectly in steel or aluminum often fail catastrophically in composites, engineered plastics, or specialty alloys. Success requires understanding material properties, selecting appropriate fastening technologies, and validating performance before full-scale production. PSM Fasteners brings 85+ years of engineering expertise to these challenges. Our [**comprehensive product catalogue**](https://psmfasteners.com/catalogue) includes hundreds of specialized fasteners designed specifically for challenging materials. When catalog products don’t fit, our custom engineering team develops tailored solutions backed by rigorous testing and ISO 9001:2015 quality standards. Whether you’re working with carbon fiber composites, PEEK medical-grade plastics, or hybrid material assemblies, the right fastener technology exists. Investing time in proper fastener selection prevents costly field failures, warranty claims, and production delays. Partner with engineers who understand both materials science and practical manufacturing constraints. ## Frequently Asked Questions About Fasteners for Special Materials ### What’s the main difference between fasteners for metals vs special materials? Special materials like composites and plastics require fasteners that distribute loads differently than metal substrates. Standard fasteners can cause cracking, delamination, or thread stripping in softer or layered materials. Specialized designs incorporate features like enlarged bearing surfaces, controlled compression, and installation methods matched to material properties. ### Can I reuse threaded inserts in plastic components? Yes, metal threaded inserts in plastics are specifically designed for repeated assembly and disassembly. The metal threads resist wear that would strip plastic threads after just a few cycles. Quality brass or stainless steel inserts can withstand dozens or hundreds of screw insertions, making them ideal for serviceable products. ### How do I prevent galvanic corrosion between carbon fiber and metal fasteners? Carbon fiber acts as a noble metal in galvanic couples, accelerating corrosion of aluminum and steel fasteners. Solutions include using titanium or stainless steel fasteners, applying isolation coatings, inserting non-conductive bushings, or using composite fasteners. The best approach depends on load requirements, environmental exposure, and cost constraints. ### What installation method works best for heat-sensitive plastics? Ultrasonic installation minimizes thermal exposure by generating heat only at the insert-plastic interface for 1-2 seconds. Press-in inserts eliminate heat entirely, using only mechanical force. For extremely sensitive materials, cold-staking or adhesive bonding may provide better alternatives. Material glass transition temperature and thickness guide method selection. ### Do specialized fasteners cost more than standard fasteners? Specialized fasteners typically carry higher unit costs due to specialized materials, precision manufacturing, and lower production volumes. However, they prevent field failures, warranty claims, and assembly rework that cost far more. The true economic comparison includes total cost of ownership, not just component price. **Categories:** Fasteners for Special Materials **Tags:** special materials --- ### [Innovative Fastening Solutions for Sheet Metal Applications](https://psmfasteners.com/innovative-sheet-metal-fastening-solutions/) **Published:** January 5, 2025 **Author:** PSM Fasteners **Excerpt:** Sheet metal is one of the most widely used materials across industries, from automotive and electronics to appliances and construction. **Content:** Sheet metal fastening solutions doesn’t need to be complicated. The right hardware turns weak points into solid connections—without welding equipment or drilling jigs slowing you down. ![Fastening Solutions for Sheet Metal Applications](https://psmfasteners.com/wp-content/uploads/2025/01/Fastening-Solutions-for-Sheet-Metal-Applications-1-1024x572.avif)Sheet metal remains one of the most versatile materials across manufacturing—from automotive body panels to electronics enclosures and industrial equipment. Yet choosing the wrong fastening method costs manufacturers thousands in assembly delays, warranty claims, and production downtime. The right sheet metal fasteners transform thin-gauge joining challenges into competitive advantages. ## Why Sheet Metal Fastening Method Selection Impacts Your Bottom Line Engineers face a critical decision: which fastening technology delivers permanent, reliable joints without compromising material integrity or slowing production? Poor fastener selection leads to thread stripping in thin materials, assembly line bottlenecks, and field failures that damage brand reputation. ### The Hidden Costs of Traditional Fastening Methods Traditional fastening approaches—welding, riveting with pre-drilled holes, or standard machine screws—introduce unnecessary complexity. Welding requires specialized equipment and skilled labor. Standard hardware often fails in materials under 2mm thickness. Each secondary operation adds cost and extends cycle time. ### How Modern Sheet Metal Fasteners Solve Assembly Challenges PSM’s [**sheet metal fasteners**](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/) provide secure, efficient joining methods specifically engineered for thin-gauge materials. Benefits include high retention strength for reliable joints, reduced installation time improving assembly efficiency by 30-40%, minimized secondary operations lowering overall production costs, and compatibility with automated systems for high-volume manufacturing. 🔧 Not Sure Which Fastener Suits Your Material and Load Requirements? Our engineering team provides **free technical consultations** to help you select the optimal fastening solution for your specific application—whether you’re working with aluminum, stainless steel, or coated materials. [ Request a Quote → ](https://psmfasteners.com/contact-us) ## 5 Types of Fastening Solutions for Sheet Metal Applications PSM offers a comprehensive range of fastening products specifically designed for sheet metal applications. Each solution addresses distinct assembly requirements and material specifications. ### 1. Self-Clinching Fasteners: Permanent Threads in Thin Materials [**Self-clinching fasteners**](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/self-clinching-nuts/) provide permanent, reusable threads in materials as thin as 0.5mm. Installation requires a simple press operation that displaces parent material into a specially designed undercut, creating a mechanical interlock. These fasteners eliminate the need for welding, tapping, or adhesives. Applications include electronics enclosures, automotive interior panels, HVAC equipment, and appliance assemblies. Material compatibility spans steel, stainless steel, aluminum, and brass with hardness ratings up to HRB 80. ### 2. Anchor Rivet Bushes: Lightweight Standoff Solutions [**Anchor rivet bushes**](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/anchor-rivet-bush/) create strong threaded mounting points in single or double-sided sheet metal access. The hollow rivet design minimizes weight while maintaining structural integrity. Installation utilizes standard rivet tools, making these ideal for field assembly and repair applications. Common uses include access panels, equipment mounting points, and circuit board standoffs. Thread sizes range from M2 to M8 in metric or #2-56 to 1/4-20 in unified threads. ### 3. Spring Steel Clips and Retainers: Vibration-Resistant Fastening [**Spring steel clips and fasteners**](https://psmfasteners.com/best-spring-steel-and-plastic-fasteners-guide/) deliver quick, secure assembly without tools in many applications. U-type nuts, J-clips, and cage nuts provide vibration resistance critical for automotive and industrial equipment. Installation requires simple push-on engagement, reducing assembly time by up to 50% compared to threaded fasteners. These solutions excel in high-vibration environments like automotive chassis, engine compartments, and heavy machinery. Material specifications typically include spring steel, stainless steel, or zinc-plated carbon steel. ### 4. Miniature Anchor Rivet Bushes: Precision Electronics Assembly [**Miniature anchor rivet bushes**](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/miniature-anchor-rivet-bush/) address the unique requirements of electronics manufacturing. Thread sizes down to M1.6 enable secure mounting in thin aluminum and steel enclosures common in consumer electronics, medical devices, and telecommunications equipment. The low installation force prevents material distortion while maintaining pull-out and torque performance. These fasteners support automated pick-and-place assembly equipment. ### 5. Self-Clinching Standoffs: Board-Level Spacing Solutions [**Self-clinching standoffs**](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/self-clinching-stand-off/) create precise spacing between circuit boards, panels, and chassis components. Threaded, blind, and thru-hole configurations accommodate diverse assembly requirements. The permanent installation resists rotation and loosening under thermal cycling. Applications span PCB mounting, panel assemblies, LED displays, and multi-level electronic enclosures. Materials include aluminum, steel, and stainless steel with various plating options for corrosion protection. ## Choosing the Right Fastening Solutions: Decision Framework Selecting the optimal sheet metal fastener requires evaluating several critical factors. Material thickness and type determine whether self-clinching, riveting, or spring clip solutions work best. Access requirements—single-sided versus double-sided—limit certain fastener types. Load specifications including pull-out strength, torque resistance, and shear capacity guide selection. Production volume influences whether manual, semi-automated, or fully automated installation makes economic sense. Environmental considerations such as corrosion exposure, temperature extremes, and vibration levels affect material and coating choices. Our [**fastener selection guide**](https://psmfasteners.com/the-complete-engineering-guide-to-fastener-selection/) provides detailed decision trees and performance data to streamline the specification process. 💰 Stop Wasting Money on Assembly Delays and Field Failures The right fastener selection prevents costly production downtime, reduces warranty claims by up to 60%, and streamlines assembly operations. Get **transparent pricing and technical specifications** for your specific application. [ Request a Quote → ](https://psmfasteners.com/contact-us) ## What PSM Fasteners Delivers Beyond Standard Products PSM’s innovative fastening technologies go beyond off-the-shelf solutions. Our ISO 9001:2015 certified quality management ensures consistent performance across every production run. Over 85 years of fastening expertise means we’ve solved assembly challenges across virtually every industry. ### Engineering Support That Accelerates Product Development Our technical team provides comprehensive application support including material compatibility analysis, installation method recommendations, torque and pull-out testing, and prototype development. This engineering partnership helps manufacturers avoid costly design iterations and accelerate time-to-market. ### Custom Fastener Manufacturing for Unique Requirements When standard products don’t meet your specifications, PSM’s [**custom fastener solutions**](https://psmfasteners.com/product_guide/custom-manufacture) deliver exactly what your application demands. We manufacture specialized configurations, unique thread specifications, custom materials and coatings, and application-specific geometries. Minimum order quantities accommodate both prototyping and high-volume production. ### Quality Assurance and Performance Validation Every PSM fastener undergoes rigorous testing including dimensional inspection, material certification, pull-out and torque testing, and salt spray corrosion resistance. This validation ensures fasteners perform reliably in real-world conditions—from -40°C to +150°C operating temperatures and high-vibration automotive environments to corrosive marine applications. ## Industries Relying on PSM’s Sheet Metal Fastening Solutions PSM’s sheet metal fasteners support critical applications across diverse manufacturing sectors. ### Automotive: Body Panels and Interior Components Automotive manufacturers depend on PSM fasteners for securing body panels, interior trim assemblies, dashboard components, and seat frame assemblies. Our solutions meet stringent automotive quality standards including IATF 16949 and withstand the extreme vibration and temperature cycling common in vehicle applications. ### Electronics: Circuit Boards and Enclosures Electronics manufacturers utilize PSM fasteners for PCB mounting and spacing, enclosure assembly, EMI/RFI shielding attachment, and heat sink mounting. The low installation force and precise tolerances prevent component damage while ensuring reliable long-term performance. ### Appliances: Durable Consumer Product Assembly Appliance manufacturers choose PSM fasteners for control panel mounting, chassis assembly, door hinge fastening, and component retention. These fasteners support automated assembly lines while delivering the durability consumers expect from modern appliances. ### Industrial Equipment: Heavy-Duty Performance Industrial equipment manufacturers require fasteners that withstand demanding conditions. PSM solutions support enclosure and panel assembly, electrical box mounting, HVAC equipment fastening, and material handling equipment. Our fasteners maintain performance under high loads, temperature extremes, and corrosive environments. ⭐ Trusted by Engineers Across Automotive, Electronics & Industrial Sectors PSM’s **ISO 9001:2015 certified manufacturing** and 85+ years of engineering expertise ensure your assemblies meet the highest quality standards. Join thousands of manufacturers who rely on our proven fastening solutions. [Start Your Project Today →](https://psmfasteners.com/product-search) ## Installation Methods and Equipment Considerations Successful sheet metal fastener installation requires understanding the appropriate equipment and techniques for each fastener type. ### Self-Clinching Installation: Press Force Requirements Self-clinching fasteners require controlled press force to properly displace parent material. Manual arbor presses work for low-volume production and prototyping. Pneumatic presses support medium-volume assembly operations. Automated PEM insertion systems enable high-volume production with consistent quality. Typical press forces range from 1 to 5 tons depending on fastener size and material hardness. ### Rivet Installation: Standard Tooling Compatibility Anchor rivet bushes install using conventional rivet tools including manual rivet guns, pneumatic rivet tools, and battery-powered rivet tools. This tooling compatibility enables field installation and repair without specialized equipment. ### Quality Verification and Inspection Installation quality verification includes visual inspection for proper seating, push-out testing for retention strength, and torque testing for threaded applications. Automated vision systems support high-volume quality control in production environments. ## Optimize Your Sheet Metal Assembly Process Modern sheet metal fastening technology transforms assembly operations from labor-intensive bottlenecks into efficient, automated processes. PSM’s comprehensive range of self-clinching fasteners, anchor rivet bushes, spring clips, and custom solutions addresses virtually every thin-gauge joining challenge. With ISO 9001:2015 certified quality management, 85+ years of engineering expertise, and global distribution from Australia, PSM delivers the fastening solutions manufacturers need to reduce costs, improve quality, and accelerate production. Whether you’re designing new products or optimizing existing assemblies, PSM’s technical team provides the support you need to succeed. **Ready to eliminate assembly delays and prevent field failures?** Contact PSM’s engineering team for application-specific recommendations and custom quotes. ## Frequently Asked Questions About Sheet Metal Fasteners ### What material thickness works with self-clinching fasteners? Self-clinching fasteners accommodate materials from 0.5mm to 6mm thickness depending on fastener size and type. Thinner materials require lower-profile fasteners with reduced installation force. Thicker materials support larger thread sizes and higher load capacities. Always consult the manufacturer’s specifications for minimum and maximum material thickness recommendations. ### How do I prevent material distortion during installation? Material distortion prevention requires proper hole sizing, controlled installation force, and appropriate support tooling. Use the manufacturer’s recommended hole diameter—typically 0.05-0.10mm larger than fastener diameter. Support thin materials with a backup plate during press installation. Automated installation equipment provides consistent force control preventing over-pressing. ### Can sheet metal fasteners withstand high-vibration applications? Yes, many sheet metal fasteners excel in high-vibration environments. Self-clinching fasteners create permanent mechanical interlocks resistant to vibration loosening. Spring steel clips provide inherent vibration resistance. Thread-locking coatings or nylon patches add extra security for threaded applications. Always specify vibration requirements when selecting fasteners for automotive or industrial equipment. ### What corrosion protection options are available? PSM offers multiple corrosion protection options including zinc plating (clear, yellow, or black), stainless steel construction (300 or 400 series), aluminum for lightweight assemblies, and specialized coatings for marine or chemical environments. Material selection depends on the specific corrosive environment and expected service life. ### How do custom fasteners address unique assembly challenges? Custom fasteners solve problems that standard products cannot including non-standard thread sizes or pitches, unique material combinations, special head styles or drive types, and application-specific geometries. PSM’s engineering team works directly with customers to design, prototype, and manufacture custom solutions. Typical lead times range from 4-8 weeks depending on complexity. **Categories:** Sheet Metal Fasteners **Tags:** fasteners, metal fasteners, PSM, sheet metal fasteners --- ### [A Beginner's Guide to Metal Fastener Types](https://psmfasteners.com/beginners-guide-metal-fastener-types/) **Published:** March 2, 2026 **Author:** PSM Fasteners **Excerpt:** Essential guide to metal fasteners—from basic threaded components to engineered solutions like inserts and **Content:** Essential guide to metal fasteners—from basic threaded components to engineered solutions like inserts and self-clinching fasteners. ![A Beginner's Guide to Metal Fastener Types](https://psmfasteners.com/wp-content/uploads/2026/03/A-Beginners-Guide-to-Metal-Fastener-Types-1024x572.avif)Understanding metal fasteners is essential for anyone involved in manufacturing, product design, or assembly operations. While many assume fasteners are just simple hardware, the reality is far more sophisticated. The right fastener choice directly impacts product durability, assembly efficiency, and long-term performance. This guide introduces the fundamental types of metal fasteners, with a focus on engineered fastening solutions that go beyond commodity hardware. Whether you’re designing consumer electronics, automotive components, or industrial assemblies, understanding these distinctions will help you make informed decisions. ### Need Help Selecting the Right Fastener? PSM Fasteners offers free technical consultations to help you identify the optimal fastening solution for your application. Our engineering team has 85+ years of combined expertise. [Request Technical Consultation](https://psmfasteners.com/contact-us) ## **Understanding the Fastener Landscape** Not all fasteners serve the same purpose. The fastening industry broadly divides into two categories: commodity hardware and engineered fastening solutions. Commodity hardware includes standard items available at general hardware stores. Engineered fastening solutions, by contrast, are precision-manufactured components designed for specific applications where standard hardware fails. Engineered fasteners address challenges that commodity hardware cannot solve. These include creating strong, reliable threads in plastics, forming permanent connections in thin sheet metal, providing vibration resistance, and maintaining joint integrity under thermal cycling or chemical exposure. The distinction matters because using commodity hardware in applications requiring engineered solutions leads to assembly failures, warranty claims, and product recalls. Conversely, over-engineering with expensive specialised fasteners where standard hardware suffices wastes budget unnecessarily. ## **Threaded Fasteners: The Foundation** Threaded fasteners use helical ridges (threads) to create mechanical advantage and clamping force. These threads can be external (on the fastener body) or internal (inside a component). Thread engagement is what creates the holding power. For metal-to-metal joints where both components are thick enough to tap, traditional threaded fasteners work well. The threads cut into or form within the base material, creating interlocking engagement. However, this approach has limitations when working with thin materials, plastics, or assemblies requiring frequent disassembly. Thread pitch (the distance between thread crests) affects both installation speed and holding strength. Coarse threads install faster and work better in softer materials, while fine threads provide superior clamping force and vibration resistance in harder materials. Thread standards vary by region—metric threads dominate globally, while unified threads remain common in North American aerospace and automotive applications. ## **Specialised Inserts for Plastics** Plastics present unique fastening challenges. Unlike metals, plastics creep under sustained loads, have lower strength, and can melt from friction during installation. Standard metal threads cut directly into plastic often strip out after just a few assembly cycles. [**Inserts for plastics**](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/) solve these problems by providing a metal thread boss within the plastic component. These engineered inserts distribute loads over a larger area, resist stripping, and enable repeated assembly and disassembly without degradation. ### **Installation Methods** Ultrasonic inserts like Tech-Sonic and Sonic-Lok use high-frequency vibration to melt the plastic around the insert, creating a molecular bond. This method is fast, clean, and ideal for high-volume production. The ultrasonic energy melts the plastic precisely at the insert interface without damaging surrounding material. Heat-installed inserts such as Heat-Lok use thermal energy to soften the plastic, allowing the insert to be pressed into position. As the plastic cools, it solidifies around the insert’s knurled or undercut features. This method works well for thermoplastics and provides excellent pull-out resistance. Press-fit inserts like Press-Lok and Taper-X rely on mechanical interference. The insert’s external features—whether tapered profiles, knurls, or expansion mechanisms—grip the plastic as force is applied. This cold installation method avoids thermal damage and suits applications where heat or vibration is impractical. Self-tapping inserts such as Screw-Sert cut their own thread path as they’re driven into a pre-formed hole. These work well for field repairs or low-volume production where dedicated installation equipment isn’t justified. ### **Material Compatibility** Different plastics require different insert designs. Rigid plastics like polycarbonate and ABS accommodate standard ultrasonic or heat-installed inserts. Softer plastics like polyethylene or nylon benefit from inserts with larger displacement zones and deeper knurls. Glass-reinforced plastics, being abrasive and less ductile, often require hardened steel inserts with modified installation parameters. ## **Sheet Metal Fasteners** Thin sheet metal—typically under 3mm thick—presents its own fastening challenges. There’s insufficient material thickness for traditional tapped threads, and welding isn’t always practical or economical.[ **Sheet metal fasteners**](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/) provide elegant solutions. ### **Self-Clinching Technology** [**Self-clinching nuts**](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/self-clinching-nuts/) install permanently into sheet metal using a simple press operation. The fastener features a serrated or knurled clinching ring that, when pressed into the metal, displaces material into an undercut or recess. This creates a mechanical interlock that resists both rotation and pull-out forces. The installation process requires access to only one side of the assembly, making self-clinching fasteners ideal for enclosed structures, chassis, and panels. Once installed, they provide a robust threaded attachment point that can withstand thousands of assembly cycles without degradation. Self-clinching studs, standoffs, and other variations extend this technology to create spacing, grounding points, or threaded projections. They’re commonly found in electronics enclosures, automotive body panels, HVAC equipment, and telecommunications infrastructure. ### **Anchor Rivet Bushes** Anchor rivet bushes (ARB) offer an alternative approach for sheet metal attachment. These install through pre-punched holes and expand mechanically to grip the material. Unlike self-clinching fasteners that require a press, ARBs can install with standard hand tools, making them suitable for field assembly and repair applications. ## **Direct Screw Fixings** [**Direct screw fixings for plastics**](https://psmfasteners.com/product_guide/direct-screw-fixings-for-plastics-light-alloys-guide/) and light alloys eliminate the need for separate inserts in many applications. These specially designed screws create their own mating threads as they’re driven, combining installation and fastening in one operation. ### **Thread-Forming vs Thread-Cutting** Thread-forming screws displace material without removing it. As the screw rotates, it pushes plastic or soft metal aside to create a mating thread. This approach generates higher pull-out resistance because the compressed material grips the thread flanks tightly. The PT series exemplifies this design for general plastics. Thread-cutting screws have cutting edges that actually remove material as they advance. While this reduces installation torque, it also produces less holding power compared to thread-forming designs. However, cutting screws work better in brittle plastics where forming might cause cracking. The Duro-PT series uses this approach for harder plastic materials. ### **Geometry Considerations** Screw geometry significantly affects performance. Wider thread spacing (coarser pitch) reduces stripping risk in soft materials but provides fewer engagement points. Finer threads increase holding power but require more installation torque and risk stripping in weak substrates. Point geometry matters too. Tapered points center the screw and reduce splitting, while blunt points may require pilot holes but distribute stress more evenly. Dual-lead threads (the PT Type DG series) combine rapid installation with strong engagement by using alternating thread pitches. ### Reduce Assembly Costs with the Right Fastener Selecting the optimal fastener type can reduce installation time by 40% and eliminate rework from stripped threads or failed joints. PSM’s engineering team helps you specify the most cost-effective solution. [Get Cost Analysis](https://psmfasteners.com/contact-us) ## **Thread Locking and Sealing** Even properly selected fasteners can fail if they loosen from vibration or leak at the thread interface. [**Thread locking and sealing solutions**](https://psmfasteners.com/product_guide/thread-locking-sealing-guide/) address these issues without requiring assembly-line changes. ### **Pre-Applied Thread Locking** Nyltite and Tuflok nylon patches are applied to fastener threads during manufacturing. When the fastener is installed, friction melts the nylon, which then re-solidifies to lock the threads. This provides vibration resistance without liquid adhesives, eliminating mess and reducing assembly time. The advantage of pre-applied locking is consistency. Every fastener has precisely the right amount of locking compound in exactly the right location. There’s no risk of over-application, under-application, or contamination that plagues field-applied liquid threadlockers. ### **Sealing Solutions** Nyplas and Nyseal provide underhead sealing to prevent fluid leakage past the fastener head. The pre-applied sealant compound compresses during installation, filling microscopic surface irregularities and creating a gasket effect. This is particularly valuable in automotive, fluid power, and outdoor applications where environmental sealing is critical. ## **Threaded Spacers and Support Pillars** Threaded spacers serve multiple functions in assembly design. They maintain precise spacing between components, provide standoff for circuit boards, create air gaps for thermal management, and offer rigid structural supports. Hexagonal spacers (SPA 01/02/03 series) allow wrench tightening for applications requiring precise torque control. Round spacers offer smooth profiles for consumer products. Acetal spacers provide electrical insulation, while metal spacers offer superior strength and thermal conductivity. ## **Compression Limiters for Precision Assembly** When fastening flexible materials like circuit boards, gaskets, or composite panels, over-tightening can cause damage.[ **Compression limiters**](https://psmfasteners.com/product_guide/compression-limiters-captive-bolt-assemblies-guide/) prevent this by providing a hard stop that defines maximum compression. These simple cylindrical components install between mating surfaces. When the fastener tightens, the limiter contacts both surfaces before the flexible material compresses excessively. This ensures consistent clamping force across all fasteners and prevents board warping or gasket crushing. Compression limiters are essential in electronics assembly, where circuit boards must be supported without deflection. They also appear in automotive lighting, sensor mounting, and any application where precise Z-axis positioning matters. ## **Spring, Steel, and Plastic Fasteners** Not every fastening application requires permanent installation or threaded engagement. Spring clips, expansion nuts, and push-on fasteners provide quick-assembly solutions for panels, trim, and components requiring frequent access. U-type nuts and J-type nuts grip sheet metal edges, creating threaded attachment points without holes or permanent modification. These find use in automotive body panels and HVAC ductwork. Cage nuts float within square holes (common in rack-mounted equipment), allowing alignment before fastener insertion. Spring latches provide positive retention with tool-free release. Edge clips retain panels within frames. These components emphasize speed and serviceability over ultimate strength. They’re ideal for applications where access frequency matters more than load capacity. ## **Material Selection Considerations** Fastener material directly affects performance, cost, and longevity. Brass offers excellent corrosion resistance and electrical conductivity but limited strength. It suits decorative applications, plumbing, and electrical connections. Stainless steel provides superior corrosion resistance in harsh environments—marine applications, chemical processing, food production. The trade-off is higher cost and potential galling during installation. Anti-seize compounds help, as does specifying the correct stainless grade for the environment. Hardened steel delivers maximum strength for high-stress applications. Aerospace, heavy machinery, and structural assemblies often specify hardened fasteners. However, hardened steel requires corrosion protection through plating or coating unless using corrosion-resistant alloys. Nylon and other plastics offer electrical insulation, chemical resistance, and light weight. They suit electronics, medical devices, and applications where metal contamination is unacceptable. The limitation is lower strength and temperature sensitivity. ## **Application-Specific Considerations** ### **Automotive Assembly** Automotive applications demand fasteners that withstand vibration, thermal cycling, and potential exposure to fuels, oils, and road salt. Self-clinching fasteners dominate chassis and body panel assembly. Thread-locking patches prevent critical fasteners from loosening. Corrosion-resistant coatings extend service life in underbody locations. ### **Electronics Manufacturing** Electronics assemblies prioritize electrical isolation, electromagnetic compatibility, and precision spacing. Inserts for plastics enable robust attachment points in enclosures. Compression limiters protect sensitive boards. Threaded spacers maintain exact standoff heights for proper grounding and thermal management. ### **Medical Device Production** Medical devices require biocompatible materials, sterilization resistance, and absolute reliability. Stainless steel fasteners dominate, often with special surface finishes. Precision-manufactured inserts prevent particulate generation that could contaminate sterile fields. ### **Renewable Energy Systems** Solar panels, wind turbines, and battery systems expose fasteners to extreme environmental conditions. UV resistance, thermal stability, and long-term corrosion resistance are non-negotiable. Specialized coatings and material selection ensure 20+ year service life. ### ISO 9001:2015 Certified Quality PSM Fasteners maintains ISO 9001:2015 certification, ensuring every component meets rigorous quality standards. With 85+ years of fastening expertise and 500+ specialised configurations, we deliver reliable solutions for critical applications. [View Our Certificate](https://psmfasteners.com/2025-psm_iso) ## **Making the Right Choice for Your Application** Selecting the appropriate metal fastener requires understanding your specific requirements: material types, assembly volume, accessibility constraints, environmental conditions, and performance expectations. Engineered fastening solutions offer significant advantages over commodity hardware when applications demand reliability, precision, or specialized performance. PSM Fasteners specializes in these engineered solutions, offering technical support to help you navigate the selection process. Whether you’re designing a new product or troubleshooting assembly issues with an existing design, working with fastening experts ensures optimal results. For assistance selecting the optimal fastening solution for your specific application, contact PSM Fasteners. Our engineering team provides free technical consultations backed by 85+ years of industry expertise and ISO 9001:2015 certified quality management. ## **Frequently Asked Questions** ### **What’s the difference between engineered fasteners and commodity hardware?** Engineered fasteners are precision-manufactured for specific applications where standard hardware fails. They address challenges like fastening into plastics, working with thin sheet metal, or maintaining joints under vibration. Commodity hardware includes standard items suitable for general construction but not specialized industrial applications. ### **When should I use inserts instead of direct screw fixings?** Use inserts when you need repeated assembly/disassembly cycles, higher pull-out strength, or when the base material (like soft plastic) cannot support threads reliably. Direct screw fixings work well for one-time or infrequent assembly in materials with adequate strength. ### **How do I prevent fasteners from loosening under vibration?** Pre-applied thread locking solutions like Nyltite or Tuflok nylon patches provide consistent vibration resistance. These eliminate the mess and inconsistency of liquid threadlockers while ensuring every fastener has proper locking capability. ### **What installation equipment do I need for self-clinching fasteners?** Self-clinching fasteners require a press (manual, pneumatic, or hydraulic) capable of generating sufficient force to displace the sheet metal into the fastener’s clinching features. PSM Fasteners can provide specific tonnage requirements based on material thickness and fastener size. ### **Can I use the same fastener for prototype and production?** Ideally, yes—but installation methods may differ. Hand-installed solutions work for prototypes, while high-volume production may justify automated equipment. Consult with PSM’s engineering team early in the design phase to select fasteners compatible with your production plans. **Categories:** Sheet Metal Fasteners **Tags:** metal fasteners, sheet metal fasteners --- ## Pages ### [Home](https://psmfasteners.com/) **Published:** October 18, 2021 **Author:** PSM Fasteners **Content:** FREE shipping for orders above $250!\* Excluding international shipping Fast Global Shipping Bulk Discounts Over 10,000+ Product Variations Trusted by 100,000+ customers **Fast Global Shipping** **Bulk Discounts** **Over 10,000+ Product Variations** **Trusted by 100,000+ Customers** **Fast Global Shipping** **Bulk Discounts** **Over 10,000+ Product Variations** **Trusted by 100,000+ Customers** [](https://psmfasteners.com/product-search/) ## Providing Fastening Solutions Since 1936 Browse our range of industry-proven quality fasteners for diverse applicationsLEARN MORE[](https://psmfasteners.com/wholesale-application-form/) ## Open a Business Account Sign up for free to take advantage of our discounted wholesale pricing with 30-day termsREGISTER NOW[](https://psmfasteners.com/product_guide/custom-manufacture) ## Want a Custom Product? Contact us to get a free quote todayCONTACT US # World-Trusted Partner in Fastening Solutions [PSM](https://www.rgafasteners-psm.com/psm-products/) has been the world’s trusted partner in [precision fastening solutions.](https://psmfasteners.com/product-search/) Recognised for innovation, reliability, and excellence since 1936, empowering customers everywhere with comprehensive products, custom engineering, and service that surpass expectations. From [direct screw fixings](https://psmfasteners.com/product-search/direct-screw-fixings-for-plastics-light-alloys) to [threaded spacers](https://psmfasteners.com/product-search/threaded-spacers-support-pillars), we deliver fastening solutions designed for performance, efficiency, and durability. https://psmfasteners.com/wp-content/uploads/2025/06/PSM.mp4#t=7 ## Shop by Category [![Product Guides banner showing Direct Screw Fixings - Fastening Solutions](https://psmfasteners.com/wp-content/uploads/2025/07/DIRECT-SCREWS-1.jpg)](https://psmfasteners.com/product_guide/direct-screw-fixings-for-plastics-light-alloys-guide/)### [Direct Screw Fixings For Plastics & Light Alloys](https://psmfasteners.com/product_guide/direct-screw-fixings-for-plastics-light-alloys-guide/) [![Banner showing Inserts for Plastics](https://psmfasteners.com/wp-content/uploads/2025/07/Inserts-for-Plastics-2.jpg)](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/)### [Inserts for 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(PCBRS-KFS2-M3)](https://psmfasteners.com/product/printed-circuit-board-self-broaching-nuts-m3-stainless-steel-4-68-knurl-diameter-psm016686-pcbrs-kfs2-m3/) Rated 0 out of 5 $0.24 Wholesale Price: $0.19 Quantity Printed Circuit Board Self Broaching Nuts M3 Stainless Steel (4.68 KNURL DIAMETER) PSM016686 (PCBRS-KFS2-M3) quantity [Add to cart](/wp-admin/admin-ajax.php?add-to-cart=10517)Request a Quote [![Printed Circuit Board Self Broaching Stand Offs M3 X 8](https://psmfasteners.com/wp-content/uploads/2025/05/Image_SCBRM38MM_2-300x300.png)](https://psmfasteners.com/product/printed-circuit-board-self-broaching-stand-offs-m3-x-8-steel-electro-tin-plated-scbrm38mm/) Hot [Quick view](#)### [Printed Circuit Board Self Broaching Stand Offs M3 X 8 Steel Electro Tin Plated (SCBRM38MM)](https://psmfasteners.com/product/printed-circuit-board-self-broaching-stand-offs-m3-x-8-steel-electro-tin-plated-scbrm38mm/) Rated 0 out of 5 $0.28 Quantity Printed Circuit Board Self Broaching Stand Offs M3 X 8 Steel Electro Tin Plated (SCBRM38MM) quantity [Add to cart](/wp-admin/admin-ajax.php?add-to-cart=10510)Request a Quote [![PT Type DG Screw](https://psmfasteners.com/wp-content/uploads/2025/05/Image_WN1542KC35X12SS_1-300x300.png)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-5-x-12-type-dg-pan-torx-stainless-steel-wn1542kc35x12ss/) Hot [Quick view](#)### [Thread Forming (PT) Screws For Light Alloys 3.5 X 12 Type DG Pan Torx Stainless Steel (WN1542KC35X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-5-x-12-type-dg-pan-torx-stainless-steel-wn1542kc35x12ss/) Rated 0 out of 5 $0.11 Quantity Thread Forming (PT) Screws For Light Alloys 3.5 X 12 Type DG Pan Torx Stainless Steel (WN1542KC35X12SS) quantity [Add to cart](/wp-admin/admin-ajax.php?add-to-cart=10343)Request a Quote [![PT Type Screws For Plastics](https://psmfasteners.com/wp-content/uploads/2025/05/Image_WN1413KC18X5ZB_1-300x300.png)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-countersunk-torx-steel-black-zinc-plated-wn1413kc18x5zb/) Hot [Quick view](#)### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Countersunk Torx Steel Black Zinc Plated (WN1413KC18X5ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-countersunk-torx-steel-black-zinc-plated-wn1413kc18x5zb/) Rated 0 out of 5 $0.07 Quantity Thread Forming (PT) Screws For Plastics 1.8 X 5 Countersunk Torx Steel Black Zinc Plated (WN1413KC18X5ZB) quantity [Add to cart](/wp-admin/admin-ajax.php?add-to-cart=10228)Request a Quote [![PT Screws For Plastics](https://psmfasteners.com/wp-content/uploads/2025/05/Image_WN1412KC30X8Z_1-300x300.png)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-torx-t10-steel-zinc-plated-wn1412kc30x8z/) Hot [Quick view](#)### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Torx (T10) Steel Zinc Plated (WN1412KC30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-torx-t10-steel-zinc-plated-wn1412kc30x8z/) Rated 0 out of 5 $0.08 Quantity Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Torx (T10) Steel Zinc Plated (WN1412KC30X8Z) quantity [Add to cart](/wp-admin/admin-ajax.php?add-to-cart=10088)Request a Quote [![Tech Sonic Inserts for Plastics M4 x 5.8](https://psmfasteners.com/wp-content/uploads/2025/05/Image_TECBM4-5.8_2-300x300.png)](https://psmfasteners.com/product/inserts-for-plastics-m4-x-5-8-tech-sonic-brass-oal-5-8mm-tecbm4-5-8/) Hot [Quick view](#)### [Inserts For Plastics M4 X 5.8 Tech-Sonic Brass OAL 5.8MM (TECBM4-5.8)](https://psmfasteners.com/product/inserts-for-plastics-m4-x-5-8-tech-sonic-brass-oal-5-8mm-tecbm4-5-8/) Rated 0 out of 5 $0.29 Quantity Inserts For Plastics M4 X 5.8 Tech-Sonic Brass OAL 5.8MM (TECBM4-5.8) quantity [Add to cart](/wp-admin/admin-ajax.php?add-to-cart=9731)Request a Quote [![Tech Sonic Brass insert](https://psmfasteners.com/wp-content/uploads/2025/05/Image_TECBM5_2-300x300.png)](https://psmfasteners.com/product/inserts-for-plastics-m5-x-9-5-tech-sonic-brass-psm04571-tecbm5/) Hot [Quick view](#)### [Inserts For Plastics M5 X 9.5 Tech-Sonic Brass PSM04571 (TECBM5)](https://psmfasteners.com/product/inserts-for-plastics-m5-x-9-5-tech-sonic-brass-psm04571-tecbm5/) Rated 0 out of 5 $0.34 Quantity Inserts For Plastics M5 X 9.5 Tech-Sonic Brass PSM04571 (TECBM5) quantity [Add to cart](/wp-admin/admin-ajax.php?add-to-cart=9733)Request a Quote [![Screw-Serts M8 Steel](https://psmfasteners.com/wp-content/uploads/2025/05/Image_SCTSM8-22I04A_2-300x300.png)](https://psmfasteners.com/product/hardened-steel-screw-serts-m8-steel-lanthane-finigard-1512110321-sctsm8-22i04a/) Hot [Quick view](#)### [Hardened Steel Screw-Serts M8 Steel Lanthane/Finigard #1512110321 (SCTSM8-22I04A)](https://psmfasteners.com/product/hardened-steel-screw-serts-m8-steel-lanthane-finigard-1512110321-sctsm8-22i04a/) Rated 0 out of 5 $0.65 Quantity Hardened Steel Screw-Serts M8 Steel Lanthane/Finigard #1512110321 (SCTSM8-22I04A) quantity [Add to cart](/wp-admin/admin-ajax.php?add-to-cart=8907)Request a Quote ## Why Choose PSM? [ LEARN MORE ABOUT PSM ](https://psmfasteners.com/about-us/) ### since 1936 ![](https://psmfasteners.com/wp-content/uploads/2025/09/1-1.avif)With almost a century of fastening expertise, PSM Fasteners has built a reputation for reliability, innovation, and customer trust. Our long history means we understand industry challenges and can deliver proven solutions. ### WE’RE CERTIFIED ![](https://psmfasteners.com/wp-content/uploads/2025/09/2-2.avif)Quality is at the core of everything we do. Our processes are backed by ISO 9001:2015 certification, ensuring consistency, precision, and accountability across manufacturing and supply. ### CUSTOM QUOTE ![](https://psmfasteners.com/wp-content/uploads/2025/09/4-1.avif)Every project is unique, and we tailor our services to fit your requirements. Whether you need a specialised part or a bulk order, we provide detailed, accurate quotes designed around your specifications. ### FAST DELIVERY ![](https://psmfasteners.com/wp-content/uploads/2025/09/3-1.avif)Time is critical in every project, and we make sure your fasteners arrive when you need them. With efficient logistics and streamlined fulfillment, we help minimise downtime and keep production schedules on track. ## Industries We Serve [ VIEW ALL ](https://psmfasteners.com/different-industries/) ### AUTOMOTIVE ### CONSUMER ELECTRONICS ### HOME APPLIANCES ### INDUSTRIAL ### MEDICAL ### RENEWABLE ENERGY ### LAWN & GARDEN EQUIPMENT ### LEISURE & ADVENTURE GEAR ### INFRASTRUCTURE & CONSTRUCTION ### AVIATION ### TELECOMMUNICATIONS ### GAS & MINING ## Latest Posts [ VIEW ALL ](https://psmfasteners.com/blog/) ## What Our Clients Say > PSM had been bloody brilliant for our workshop – top-notch fasteners delivered on time, every time. Can’t fault their technical advice either. Cheers! > ![](https://secure.gravatar.com/avatar/bcbaf9cbfdfaaadf879cb30b1c17024340fc77d5b303912177970aae9f664f17?s=120&d=mm&r=g) > [Mick](#) > Rated 4 out of 5 > Stoked with the custom fastener management system PSM set us up with – saved us heaps on stock and downtime. Legends! > [Jess](#) > Rated 4 out of 5 > These fellas know their gear. PSM brass inserts are spot‑on quality, saved us loads of fiddly fixes. Wouldn’t go anywhere else. One loyal customer here. > [Dave](#) > Rated 5 out of 5 > Four generations of fastener smarts – you can tell PSM know their onions. Always helpful, always reliable. I’ll be swingin’ by again soon! Thanks mate! > [Emma](#) > Rated 5 out of 5 --- ### [Contact Us](https://psmfasteners.com/contact-us/) **Published:** January 18, 2021 **Author:** PSM Fasteners **Content:** # Contact Us #### ![](https://psmfasteners.com/wp-content/uploads/2022/07/phone.png)Call Us: Contact us Mondays – Fridays 7:30 – 4:30 PM AEST [+61 2 9026 8383](tel:+61290268383) #### ![contact us](https://psmfasteners.com/wp-content/uploads/2022/07/mail.png)Write to Us: Fill out our form and we will contact you within 24 hours. Email: #### ![](https://psmfasteners.com/wp-content/uploads/2022/07/location.png)Headquarters: 159-163 Victoria Road Marrickville NSW 2204 Mondays – Fridays: 7:30 – 4:30 PM AEST This form is protected by [**Privacy Policy**](https://psmfasteners.com/privacy-policy/) and **[Terms and Conditions.](https://psmfasteners.com/terms-and-conditions/)** --- ### [Feedback Form](https://psmfasteners.com/feedback-form/) **Published:** May 7, 2026 **Author:** morantaalona **Content:** # Feedback Form ## Tell Us About Your Experience We value your feedback. Please let us know how we did, whether you were browsing products, requesting a quote, placing an order, or contacting our team. Your comments help us improve our website, product information, and customer support experience. --- ### [Product Search](https://psmfasteners.com/product-search/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Content:** FREE shipping for orders above $250!\* Excluding international shipping ### Fast Global Shipping ### Bulk Discounts ### Over 10,000+ Product Variations ### Trusted by 100,000+ customers **Fast Global Shipping** **Bulk Discounts** **Over 10,000+ Product Variations** **Trusted by 100,000+ Customers** **Fast Global Shipping** **Bulk Discounts** **Over 10,000+ Product Variations** **Trusted by 100,000+ Customers** Product Type 1 [ ![Direct Screw Fixings - Fastening Solutions](https://psmfasteners.com/wp-content/uploads/2025/08/pt-pan-enhanced.avif) ](https://psmfasteners.com/product-search/direct-screw-fixings-for-plastics-light-alloys) ## DIRECT SCREW FIXINGS FOR PLASTICS & LIGHT ALLOYS [](https://psmfasteners.com/product-search/inserts-for-plastics) ## INSERTS FOR PLASTICS [](https://psmfasteners.com/product-search/sheet-metal-fasteners) ## SHEET METAL FASTENERS [](https://psmfasteners.com/product-search/threaded-spacers-support-pillars) ## THREADED SPACERS & SUPPORT PILLARS [](https://psmfasteners.com/product-search/fasteners-for-special-materials) ## FASTENERS FOR SPECIAL MATERIALS [](https://psmfasteners.com/product-search/spring-steel-plastic-fasteners) ## SPRING STEEL & PLASTIC FASTENERS [ ![Direct Screw Fixings - Fastening Solutions](https://psmfasteners.com/wp-content/uploads/2025/08/pt-pan-enhanced.avif) ](https://psmfasteners.com/product-search/direct-screw-fixings-for-plastics-light-alloys) ## DIRECT SCREW FIXINGS FOR PLASTICS & LIGHT ALLOYS [](https://psmfasteners.com/product-search/inserts-for-plastics) ## INSERTS FOR PLASTICS [](https://psmfasteners.com/product-search/sheet-metal-fasteners) ## SHEET METAL FASTENERS [](https://psmfasteners.com/product-search/threaded-spacers-support-pillars) ## THREADED SPACERS & SUPPORT PILLARS [](https://psmfasteners.com/product-search/fasteners-for-special-materials) ## FASTENERS FOR SPECIAL MATERIALS [](https://psmfasteners.com/product-search/spring-steel-plastic-fasteners) ## SPRING STEEL & PLASTIC FASTENERS # Search PSM Fasteners Products Step 1: Select Categories All Product Type 1 Direct Screw Fixings For Plastics & Light AlloysInserts For PlasticsSheet Metal FastenersThreaded Spacers & Support PillarsFasteners For Special MaterialsSpring Steel & Plastic Fasteners All Product Type 2 All Product Type 3 All Drive Type All Material All Finish All Thread All Size All Length Dimension Step 2: Refine Search Reset Filters × ### Request a Quote Submit Request Thank you! We’ll get in touch soon. [ CUSTOM MANUFACTURER ](https://psmfasteners.com/product_guide/custom-manufacture) [ Specification not listed? contact us ](https://psmfasteners.com/contact-us/) ### Choosing the Right Fasteners PSM Fasteners is a leading manufacturer and distributor of [specialised fasteners](https://psmfasteners.com/product-search/) and joining solutions. Our focus is on helping engineers and designers find the exact fastener they need for their application, no matter if it’s in plastics, sheet metal, or special materials. With decades of experience, global quality standards, and a wide stock of components, we provide both off-the-shelf and custom solutions. PSM is committed to fast delivery, technical support, and ensuring that each product performs reliably under real-world conditions. ### **Top Considerations When Selecting Fasteners** Choosing the right fastener isn’t just a matter of selecting a screw; it’s about matching performance, materials, and method of installation. Below are the factors to keep in mind, especially if you are comparing fixing screws, inserts for plastics, fasteners for special materials, sheet metal fasteners, or threaded spacers and support pillars. 1. **Material & Substrate** – What material are you fastening into? Plastics, composites, laminates, or light alloys often require different designs from standard metals. [Fasteners for special materials](https://psmfasteners.com/product-search/fasteners-for-special-materials) are engineered to grip securely without damaging sensitive or low-strength substrates. 1. **Load and Mechanical Strength** – Consider pull-out strength, torque, shear load, and vibration resistance. For assemblies that require spacing or insulation (for example in electronic equipment), using threaded spacers and support pillars can maintain precise separation and structural stability while withstanding mechanical stresses. 1. **Appearance & Environment** – If your product is exposed to moisture, heat, chemicals, or UV, you may need coated, sealed, or corrosion-resistant fasteners. [Sheet metal fasteners](https://psmfasteners.com/product-search/sheet-metal-fasteners) must also resist fatigue, and often need low profile finishes, flush mounting, or designs that avoid stress concentrations. 1. **Installation Method** – [Fixing screws](https://psmfasteners.com/product-search/direct-screw-fixings-for-plastics-light-alloys), especially designed for plastics or light alloys, are useful where you want to directly drive the fastener without pre-formed threads. In contrast, some fasteners require inserts, press-in, clinching or heat/ultrasonic installation. Choose an installation method that matches your production capabilities. 1. **Cost, Assembly Speed, & Lifecycle** – Consider not only material cost but also how fast assemblies can be completed, rework avoided, and maintenance required. Proper selection early on saves cost, reduces rejects, and improves product life. ### **Frequently Asked Questions** #### **What is a fixing screw? A fixing screw is a type of thread-forming or self-threading fastener specifically designed to be driven into plastics or light alloys, often without needing a tapped or pre-threaded hole. It offers quick installation while maintaining strength. #### **How are sheet metal fasteners different from regular fasteners?** [Sheet metal fasteners](https://psmfasteners.com/product-search/sheet-metal-fasteners) are designed to form strong, durable threads in thin metal sheets or embed into sheet metal via [clinching](https://psmfasteners.com/product-search/sheet-metal-fasteners/self-clinching-nut) or [riveting](https://psmfasteners.com/product-search/sheet-metal-fasteners/anchor-rivet-bush). They allow permanent load-bearing joints without needing welding, and often withstand vibration and cyclic load better. #### **What are threaded spacers and support pillars for? [Threaded spacers and support pillars](https://psmfasteners.com/product-search/threaded-spacers-support-pillars) are used to maintain precise separation between components, align assemblies, and sometimes provide insulation. In electronics, for example, they help avoid shorts, stabilise [PCBs](https://psmfasteners.com/product_guide/fasteners-for-special-materials-guide/printed-circuit-board-fasteners), and improve airflow or thermal management. #### **What are the different sizes of fasteners? Fasteners are available in a wide range of sizes, from miniature screws and inserts used in electronics to large bolts and studs for heavy-duty applications. Sizes are typically specified by diameter, length, and thread pitch, and PSM offers over 10,000 variations to meet industry requirements. #### **What are common uses of fasteners? Fasteners are used in virtually every industry, including automotive, aerospace, consumer electronics, telecommunications, and industrial machinery. They hold components together, provide electrical grounding, maintain spacing, and ensure structural stability across applications of all sizes. ### **Ready to Find the Right Fastener?** Choosing the right fastening solution doesn’t have to be complicated. At PSM Fasteners, we combine a comprehensive product range with expert engineering support to guide you every step of the way. Whether you need fixing screws, sheet metal fasteners, or custom-engineered solutions, our team is here to help. --- ### [Shipping Policy](https://psmfasteners.com/shipping-policy/) **Published:** April 22, 2026 **Author:** morantaalona **Content:** ## Shipping Policy At PSM Fasteners, we aim to provide clear, transparent, and reliable shipping services for all customers. ### Order Processing Orders are typically processed within 1–2 business days after payment is received. Orders are not processed or shipped on weekends or on public holidays. ### Shipping Costs Shipping costs are calculated at checkout based on order size, weight, and delivery location. Any applicable fees will be clearly displayed before purchase. ### Delivery Timeframes Estimated delivery times depend on your location and selected shipping method: - Standard Shipping: 2-6 business days - Express Shipping: 1–2 business days - International Shipping: 1-5 business days Delivery times are estimates and may vary due to carrier delays or external factors. ### Shipping Locations We ship Australia-wide and to most international destinations. Availability will be confirmed at checkout. ### Tracking Information All shipped orders include tracking. Customers will receive tracking details via email once the order has been dispatched. ### Customs, Duties & Taxes (International Orders) International customers are responsible for any customs duties, taxes, or import fees imposed by their country. ### Delivery Issues If your order is delayed, lost, or arrives damaged, please contact us promptly at so we can assist in resolving the issue. ### Address Accuracy Customers are responsible for providing accurate shipping details. We are not liable for orders delivered to incorrect addresses supplied at checkout. ### Contact Information For any shipping-related inquiries, please contact: This shipping policy is provided to ensure transparency and compliance with advertising standards and may be updated at any time without notice. --- ### [Catalogue](https://psmfasteners.com/catalogue/) **Published:** June 15, 2025 **Author:** PSM Fasteners **Content:** # PSM Product Catalogue ![PSM Catalogue 3D mockup in transparent background](https://psmfasteners.com/wp-content/uploads/2025/08/catalogue-cover.avif) [ View Flipbook Online ](https://online.fliphtml5.com/juaqf/nsyp/) ## Get the Catalogue Now Looking for high-performance fastening solutions? You’ve come to the right place. Click the button below to download your copy of the catalogue in PDF format: [ Download the Catalogue ](https://drive.google.com/file/d/1X4sI_cUy5QLHmLan8Tr_BMzOk36R3KI4/view?usp=sharing) Need help selecting the right fastener? [**Contact our technical team**](https://psmfasteners.com/contact-us/) or call us directly — we’re here to assist you. --- ### [Standards](https://psmfasteners.com/standards/) **Published:** June 15, 2025 **Author:** PSM Fasteners **Content:** # Standards ## PSM Fasteners is ISO 9001:2015 certified PSM Fasteners Pty. Ltd. have a firm commitment to supplying products of the highest quality which merit complete customer satisfaction throughout their effective life. Our goal is to achieve superior customer satisfaction levels and it is therefore important that all products supplied are totally operational, functional and comply with the customer’s specification. It is the management’s clear intent that PSM Fasteners Pty. Ltd. Quality Policy and its objectives are properly adhered to, that resources are provided to an adequate level and the [quality system](https://www.iso.org/standard/62085.html) is continually reviewed for improvements to enable PSM Fasteners Pty. Ltd. to maintain their competitive position without prejudicing its long earned reputation for supplying service and product of the highest standard. [ VIEW CERTIFICATE ](https://psmfasteners.com/2025-psm_iso/) ![Hazardous substance](https://psmfasteners.com/wp-content/uploads/2025/06/IMG_2908.jpeg)## ROHS European Union Restriction of the Use of Hazardous Substances From 1st July 2006 the EU will enforce council directive 2002/95/EC restricting the use of; Mercury (Hg), Cadmium (cd), Hexavalent Chromium (cr6+), Lead (Pb), Polybrominated Biphenyl (PBB), Polybrominated Diphenyl Ether (PBDE) in Electrical & Electronic equipment. P.S.M Fasteners Pty. Ltd. are fully aware of these guidelines and can supply fully compliant product. ## H.R. 4173 The Wall Street Reform and Consumer Protection Act (the “Act”) The Act imposes Securities and Exchange Commission (“SEC”) reporting requirements relating to “Conflict Minerals”. As defines under the Act, Conflict Minerals include coltan, niobium, tantalum, tin, gold and tungsten, their derivatives, and/or other substance designated by the Secretary of State. Specifically, the Act requires that all publically-traded manufacturing companies report annually to the SEC whether they use Conflict Minerals that are necessary to the functionality or product that they manufacture or contract to have manufactured, and which originate from the Democratic Republic of Congo (the “DRC”) or an adjoining country (Angola, Burundi, Central African Republic, Congo Republic, Rwanda, Sudan, Tanzania, Uganda and/or Zambia). With regard to the Act stated above and as a supplier we at all times try to ensure that the goods/parts we supply do not contain one or more of the identified Conflict Minerals, they either do NOT originate from the DRC or an adjoining country. --- ### [Privacy Policy](https://psmfasteners.com/privacy-policy/) **Published:** January 17, 2021 **Author:** PSM Fasteners **Content:** # Privacy Policy ##### Who we are Our website address is: . ##### What personal data we collect and why we collect it **Comments** When visitors leave comments on the site we collect the data shown in the comments form, and also the visitor’s IP address and browser user agent string to help spam detection. An anonymized string created from your email address (also called a hash) may be provided to the Gravatar service to see if you are using it. The Gravatar service privacy policy is available here: [automattic.com/privacy](https://automattic.com/privacy/). After approval of your comment, your profile picture is visible to the public in the context of your comment. **Media** If you upload images to the website, you should avoid uploading images with embedded location data (EXIF GPS) included. Visitors to the website can download and extract any location data from images on the website. **Contact forms** ###### Cookies If you leave a comment on our site you may opt-in to saving your name, email address and website in cookies. These are for your convenience so that you do not have to fill in your details again when you leave another comment. These cookies will last for one year. If you visit our login page, we will set a temporary cookie to determine if your browser accepts cookies. This cookie contains no personal data and is discarded when you close your browser. When you log in, we will also set up several cookies to save your login information and your screen display choices. Login cookies last for two days, and screen options cookies last for a year. If you select “Remember Me”, your login will persist for two weeks. If you log out of your account, the login cookies will be removed. If you edit or publish an article, an additional cookie will be saved in your browser. This cookie includes no personal data and simply indicates the post ID of the article you just edited. It expires after 1 day. **Embedded content from other websites** Articles on this site may include embedded content (e.g. videos, images, articles, etc.). Embedded content from other websites behaves in the exact same way as if the visitor has visited the other website. These websites may collect data about you, use cookies, embed additional third-party tracking, and monitor your interaction with that embedded content, including tracking your interaction with the embedded content if you have an account and are logged in to that website. ##### Who we share your data with If you request a password reset, your IP address will be included in the reset email. ##### How long we retain your data If you leave a comment, the comment and its metadata are retained indefinitely. This is so we can recognize and approve any follow-up comments automatically instead of holding them in a moderation queue. For users that register on our website (if any), we also store the personal information they provide in their user profile. All users can see, edit, or delete their personal information at any time (except they cannot change their username). Website administrators can also see and edit that information. ##### What rights you have over your data If you have an account on this site, or have left comments, you can request to receive an exported file of the personal data we hold about you, including any data you have provided to us. You can also request that we erase any personal data we hold about you. This does not include any data we are obliged to keep for administrative, legal, or security purposes. ##### Where we send your data Visitor comments may be checked through an automated spam detection service. #### DASHBOARD [My Account](https://psmfasteners.com/my-account/) [Shopping Cart](https://psmfasteners.com/shopping-cart/) [Order Tracking](https://psmfasteners.com/order-tracking/) [Custom Manufacturer](https://psmfasteners.com/product_guide/custom-manufacture) #### USEFUL LINKS [Product Search](https://psmfasteners.com/product-search/) [Product Guide](https://psmfasteners.com/product-guide/) [Privacy Policy](https://psmfasteners.com/privacy-policy/) [Return & Refunds](https://psmfasteners.com/refund_returns/) [Contact Us](https://psmfasteners.com/contact-us/) [Blog](https://psmfasteners.com/blog/) #### PRODUCT CATEGORIES - [ Uncategorized ](https://psmfasteners.com/product-category/psm-products/) - [ Direct Screw Fixings For Plastics & Light Alloys ](https://psmfasteners.com/product-category/product-category-direct-screw-fixings-for-plastics-light-alloys/) - [ Fasteners For Special Materials ](https://psmfasteners.com/product-category/product-category-fasteners-for-special-materials/) - [ Inserts For Plastics ](https://psmfasteners.com/product-category/product-category-inserts-for-plastics/) - [ Sheet Metal Fasteners ](https://psmfasteners.com/product-category/product-category-sheet-metal-fasteners/) #### GET THE LATEST NEWS #### FOLLOW US [ Facebook ](https://www.facebook.com/psmfasteners/) [ Youtube ](https://www.youtube.com/@PSMFasteners) [ Linkedin ](https://www.linkedin.com/company/psmfasteners/) --- ### [Standards](https://psmfasteners.com/standards-2/) **Published:** November 6, 2025 **Author:** galeon.vanie@gmail.com **Content:** # Standards ## PSM Fasteners is ISO 9001:2015 certified PSM Fasteners Pty. Ltd. have firm standards to supplying products of the highest quality which merit complete customer satisfaction throughout their effective life. Our goal is to achieve superior customer satisfaction levels and it is therefore important that all products supplied are totally operational, functional and comply with the customer’s specification. It is the management’s clear intent that PSM Fasteners Pty. Ltd. Quality Policy and its objectives are properly adhered to, that resources are provided to an adequate level and the [quality system](https://www.iso.org/standard/62085.html) is continually reviewed for improvements to enable P.S.M Fasteners Pty. Ltd. to maintain their competitive position without prejudicing its long earned reputation for supplying service and product of the highest standard. [ VIEW CERTIFICATE ](https://psmfasteners.com/2025-psm_iso/) ![Hazardous substance](https://psmfasteners.com/wp-content/uploads/2025/06/IMG_2908.jpeg)## ROHS European Union Restriction of the Use of Hazardous Substances From 1st July 2006 the EU will enforce council directive 2002/95/EC restricting the use of; Mercury (Hg), Cadmium (cd), Hexavalent Chromium (cr6+), Lead (Pb), Polybrominated Biphenyl (PBB), Polybrominated Diphenyl Ether (PBDE) in Electrical & Electronic equipment. P.S.M Fasteners Pty. Ltd. are fully aware of these guidelines and can supply fully compliant product. ## H.R. 4173 The Wall Street Reform and Consumer Protection Act (the “Act”) The Act imposes Securities and Exchange Commission (“SEC”) reporting requirements relating to “Conflict Minerals”. As defines under the Act, Conflict Minerals include coltan, niobium, tantalum, tin, gold and tungsten, their derivatives, and/or other substance designated by the Secretary of State. Specifically, the Act requires that all publically-traded manufacturing companies report annually to the SEC whether they use Conflict Minerals that are necessary to the functionality or product that they manufacture or contract to have manufactured, and which originate from the Democratic Republic of Congo (the “DRC”) or an adjoining country (Angola, Burundi, Central African Republic, Congo Republic, Rwanda, Sudan, Tanzania, Uganda and/or Zambia). With regard to the Act stated above and as a supplier we at all times try to ensure that the goods/parts we supply do not contain one or more of the identified Conflict Minerals, they either do NOT originate from the DRC or an adjoining country. --- ### [Refund and Returns Policy](https://psmfasteners.com/refund_returns/) **Published:** August 19, 2025 **Author:** PSM Fasteners **Content:** # Returns & Exchanges We want you to be completely satisfied with your [purchase](https://www.rgafasteners-psm.com/psm-products/). If you are not, you may return [eligible items](https://psmfasteners.com/product-search/) within 90 days of delivery. ##### **Eligibility** - Items must be unused, in original packaging, and in resellable condition. - Proof of purchase (invoice or order number) is required. - Special orders, customised products, or clearance items may not be eligible for return unless faulty. ##### Process 1. Email i[nfo@psmfasteners.com ](mailto:info@psmfasteners.com)within 90 days of receiving your order. 2. We will provide instructions for return shipping. 3. Once your return is received and inspected, we will process your refund to your original payment method (excluding shipping costs, unless the product is faulty). ##### Change of Mind Returns Accepted within 90 days, provided goods meet the above eligibility criteria. Return shipping costs are the responsibility of the customer. ##### Faulty or Damaged Goods Under the Australian Consumer Law, you are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. If the product is faulty, damaged, or not as described, we will cover the cost of return shipping and provide a full refund or replacement. ##### Contact For any return and refund queries, please contact us at . #### DASHBOARD [My Account](https://psmfasteners.com/my-account/) [Shopping Cart](https://psmfasteners.com/shopping-cart/) [Order Tracking](https://psmfasteners.com/order-tracking/) [Custom Manufacturer](https://psmfasteners.com/product_guide/custom-manufacture) #### USEFUL LINKS [Product Search](https://psmfasteners.com/product-search/) [Product Guide](https://psmfasteners.com/product-guide/) [Privacy Policy](https://psmfasteners.com/privacy-policy/) [Contact Us](https://psmfasteners.com/contact-us/) [Blog](https://psmfasteners.com/blog/) #### FOLLOW US [ Facebook ](https://www.facebook.com/psmfasteners/) [ Youtube ](https://www.youtube.com/@PSMFasteners) [ Linkedin ](https://www.linkedin.com/company/psmfasteners/) --- ### [Engineered Fasteners by PSM Fasteners](https://psmfasteners.com/engineered-fasteners-by-psm-international/) **Published:** September 2, 2025 **Author:** PSM Fasteners **Content:** ![PSM blue logo](https://psmfasteners.com/wp-content/uploads/2025/09/PSM-logo.avif) [ Facebook-f ](https://www.facebook.com/psmfasteners/) [ Linkedin ](#) [ Youtube ](#) ## Precision Fastening Solutions for Global Industries PSM Fasteners is a global leader in engineered fasteners, serving the automotive, electronics, industrial, appliance, and medical sectors. With nearly 100 years of innovation, we specialize in fasteners that drive efficiency, durability, and cost-effectiveness across every application. ## PSM’s Engineered Fasteners Boost reliability, reduce costs, and streamline assembly with our comprehensive fastener technologies ![Banner showing inserts for plastics - Engineered fasteners](https://psmfasteners.com/wp-content/uploads/2025/06/Inserts-for-Plastic-Image-01-1.jpg)### Inserts for Plastics Engineered for strong, reusable threads in plastic components: Heat-installed inserts Ultrasonic inserts Mold-in inserts ![Banner showing Sheet Metal Fasteners](https://psmfasteners.com/wp-content/uploads/2025/06/Sheet-Metal-Fasteners-Image-01-1.jpg)### Sheet Metal Fasteners Ideal for thin sheet materials requiring high-strength solutions: FlangeForm® Fasteners Studs and standoffs Clinch nuts and spacers ![Banner showing Direct Screw Fixings](https://psmfasteners.com/wp-content/uploads/2025/06/Direct-Screw-fixings-Image-01-2.jpg)### Direct Screw Fixings Direct screw-in solutions optimized for plastic materials: PT® Screws PSM custom geometries ![custom and special fasteners](https://psmfasteners.com/wp-content/uploads/2025/09/1.avif)### Custom & Special Fasteners Tailored to your exact engineering needs: Compression limiters Locating pins Custom inserts & bushings ![automated feed system fasteners](https://psmfasteners.com/wp-content/uploads/2025/09/2.avif)### Automated Feed Systems Designed for automated and high-volume production environments: Bolt feeders Nut feeders Robotic system integration ![Threaded spacers and support pillars](https://psmfasteners.com/wp-content/uploads/2025/09/Threaded-spacers.avif)### Threaded spacers & support pillars Provide a convenient means of spacing panels and other components with standard nuts and machine screws. Hexagonal spacers Acetal spacers High strength insulating spacers Round plain hole spacers ## Global Manufacturing & Supply Chain Network Our global footprint ensures fast delivery, local expertise, and consistent quality. - Global manufacturing hubs - Global technical centres - Local teams in 20+ countries ## Engineering Support & Quality Assurance We partner with OEMs through every stage of the product lifecycle: - Application engineering & prototyping - In-house testing: torque, vibration, and environmental - RoHS & REACH compliant - ISO 9001:2015 certified - Conflict mineral compliance ## Why Choose PSM? ### Extensive Experience Over 90 years of fastening innovation and continuously evolving to meet the demands of modern manufacturing. ### End-to-end project support From purchase to delivery, we guide you in the process. Our expert team ensures efficiency all throughout. ### Global reach, local support A worldwide network with local specialists ready to assist you. ### Automation-ready systems Designed for seamless integration into automated production lines. ### Trusted by leading OEMs worldwide Partnered with industry leaders across diverse sectors. ## Request a Quote or Sample Looking for reliable, high-performance fastening solutions? ### Request a Quote Get fast, competitive pricing tailored to your project needs. [ request now ](https://psmfasteners.com/request-a-quote/) ##### Download Product Catalogue Explore our full range of fastening solutions in one convenient guide. [ download ](https://drive.google.com/file/d/1DLhbQYl7tbysqWCDVdN92vfA041JD88l/view?usp=drivesdk) ##### Contact Our Team Reach out to our experts for personalised support and advice. [ contact us ](https://psmfasteners.com/contact-us/) ![PSM white logo](https://psmfasteners.com/wp-content/uploads/2025/09/Logo-white-scaled-e1756784652336.avif)Global provider of engineered fastening solutions for decades. We design, manufacture, and distribute specialized fasteners and joining systems, serving industries like automotive, electronics, medical, and beyond. [ Facebook-f ](https://www.facebook.com/psmfasteners/) [ Linkedin ](#) [ Youtube ](#) Quick Links Get In Touch 159 – 163 Victoria Road Marrickville, NSW 2204 - info@psmfasteners.com - +61 2 9026 8383 - 7:30 AM to 4:30 PM © 2025 PSM Fasteners. All rights reserved. Part of the Bulten Group. --- ### [Product Guide](https://psmfasteners.com/product-guide/) **Published:** June 15, 2025 **Author:** PSM Fasteners **Content:** # PSM Fasteners Product Guide [PSM](https://www.rgafasteners-psm.com/)’s [specialised fastening solutions](https://psmfasteners.com/product-search/) are engineered to meet the demanding requirements of modern industries, where standard fasteners may not provide the strength, precision, or durability needed. Our product guides show how we developed our fasteners to work seamlessly with plastics, sheet metal, special substrates, and electronics, while offering efficient installation, long-term performance, and compliance with global quality standards. With the combination of innovative design and advanced manufacturing, our fastening systems simplify assembly, reduce production costs, and extend product life cycles. Backed by decades of expertise and global quality standards, PSM products ensure durability, structural integrity, and cost efficiency. Beyond supplying components, we provide strong technical guidance to help optimize assembly processes, making PSM a trusted partner for industries worldwide. ## Product Categories [ ![Product Guides banner showing Direct Screw Fixings - Fastening Solutions](https://psmfasteners.com/wp-content/uploads/2025/07/DIRECT-SCREWS-1-1024x576.jpg) ](https://psmfasteners.com/product_guide/direct-screw-fixings-for-plastics-light-alloys-guide/) #### [Direct Screw Fixings for Plastics & Light Alloys](https://psmfasteners.com/product_guide/direct-screw-fixings-for-plastics-light-alloys-guide/) Our PT screw series and related designs allow fast, reliable installation directly into plastics and light alloys without the need for pre-tapped holes. They provide strong resistance to pull-out forces while reducing assembly time. **[READ MORE](https://psmfasteners.com/product_guide/direct-screw-fixings-for-plastics-light-alloys-guide/)** [ ![Banner showing Inserts for Plastics](https://psmfasteners.com/wp-content/uploads/2025/07/Inserts-for-Plastics-2-1024x576.jpg) ](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/) #### [Inserts for Plastics](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/) From ultrasonic and heat-installed inserts to press-in and self-tapping versions, these components create durable, reusable threads in plastic parts. They improve torque resistance, wear life, and reliability for high-performance plastic assemblies. **[READ MORE](https://psmfasteners.com/product_guide/inserts-for-plastics-guide/)** [ ![Banners showing Fasteners for Special Materials](https://psmfasteners.com/wp-content/uploads/2025/07/fasteners-for-special-materials.webp-1-1024x576.jpg) ](https://psmfasteners.com/product_guide/fasteners-for-special-materials-guide/) #### [Fasteners for Special Materials](https://psmfasteners.com/product_guide/fasteners-for-special-materials-guide/) These include precision hardened inserts, studs, and screw-serts designed for composites, laminates, and other difficult substrates. They provide secure fastening while preserving material integrity under high stress. **[READ MORE](https://psmfasteners.com/product_guide/fasteners-for-special-materials-guide/)** [ ![Banner showing Sheet Metal Fasteners](https://psmfasteners.com/wp-content/uploads/2025/07/Sheet-Metal-Fasteners-2-1024x576.jpg) ](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/) #### [Sheet Metal Fasteners](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/) Our self-clinching nuts, studs, rivet bushes, and stand-offs are engineered to embed securely in sheet metal, creating permanent threads without welding or complex machining. They deliver strong, vibration-resistant performance with minimal space requirements. **[READ MORE](https://psmfasteners.com/product_guide/sheet-metal-fasteners-guide/)** [ ![Banner showing different types of Spring Steel & Plastic Fasteners](https://psmfasteners.com/wp-content/uploads/2025/07/Spring-Steel-Plastic-Fasteners-1-1024x576.jpg) ](https://psmfasteners.com/product_guide/spring-steel-plastic-fasteners-guide/) #### [Spring Steel & Plastic Fasteners](https://psmfasteners.com/product_guide/spring-steel-plastic-fasteners-guide/) Our PT screw series and related designs allow fast, reliable installation directly into plastics and light alloys without the need for pre-tapped holes. They provide strong resistance to pull-out forces while reducing assembly time. **[READ MORE](https://psmfasteners.com/product_guide/spring-steel-plastic-fasteners-guide/)** [ ![Banner showing Threaded Spacers & Support Pillars](https://psmfasteners.com/wp-content/uploads/2025/07/Threaded-Spacers-Support-Pillars-1-1024x576.jpg) ](https://psmfasteners.com/product_guide/threaded-spacers-support-pillars-guide/) #### [Threaded Spacers & Support Pillars](https://psmfasteners.com/product_guide/threaded-spacers-support-pillars-guide/) Available in hexagonal, round, and insulating types, spacers and pillars ensure precise component separation, stability, and alignment in electronic and mechanical assemblies. They are essential for PCBs and multi-level builds. **[READ MORE](https://psmfasteners.com/product_guide/threaded-spacers-support-pillars-guide/)** [ ![Screws applied with Thread Locking & Sealing](https://psmfasteners.com/wp-content/uploads/2025/07/THREADED-LOCKING-1-1024x576.jpg) ](https://psmfasteners.com/product_guide/thread-locking-sealing-guide/) #### [Thread Locking & Sealing](https://psmfasteners.com/product_guide/thread-locking-sealing-guide/) Our Nyseal and Nyplas products, along with other pre-applied sealants and adhesives, prevent loosening and protect against leakage, vibration, and environmental exposure. These solutions improve assembly reliability and reduce maintenance. **[READ MORE](https://psmfasteners.com/product_guide/thread-locking-sealing-guide/)** [ ![Compression Limiters & Captive Bolt Assemblies](https://psmfasteners.com/wp-content/uploads/2025/07/COMPRESSION-LIMITERS-CAPTIVE-BOLT-ASSEMBLIES-1-1024x576.jpg) ](https://psmfasteners.com/product_guide/compression-limiters-captive-bolt-assemblies-guide/) #### [Compression Limiters & Captive Bolt Assemblies](https://psmfasteners.com/product_guide/compression-limiters-captive-bolt-assemblies-guide/) Compression limiters protect plastic parts from over-tightening, while captive bolt assemblies ensure that fasteners remain in place even when loosened, improving safety and assembly efficiency. **[READ MORE](https://psmfasteners.com/product_guide/compression-limiters-captive-bolt-assemblies-guide/)** [ ![Custom manufacturer icon](https://psmfasteners.com/wp-content/uploads/2025/08/Custom-Manufacturer-1-1024x576.avif) ](https://psmfasteners.com/product_guide/custom-manufacture/) #### [Custom Manufacture](https://psmfasteners.com/product_guide/custom-manufacture/) For unique applications, PSM provides custom-engineered fastening solutions. Our team collaborates with customers to design, test, and manufacture tailored products that meet specific technical and commercial requirements. [**REQUEST A QUOTE**](https://psmfasteners.com/product_guide/custom-manufacture/) ## Frequently Asked Questions What makes specialized fasteners different from standard ones? Specialized fasteners are designed for specific substrates such as plastics, sheet metal, or composites, and are optimized for strength, reliability, and assembly efficiency. Unlike standard screws or bolts, they solve unique engineering challenges by ensuring secure joints that resist vibration, wear, and environmental stress. Which industries benefit most from PSM’s solutions? PSM’s specialized fastening solutions are widely used in automotive, aerospace, electronics, telecommunications, and consumer products. These industries rely on precision-engineered fasteners to ensure structural integrity, reduce assembly costs, and maintain performance under demanding operating conditions. How can I choose the right fastener? Selecting the correct fastener starts with identifying the substrate material, the installation method, and the required performance characteristics such as torque or pull-out strength. Consulting PSM’s technical datasheets or working with our Application Engineers ensures you select the most suitable specialized fastening solution for your project. Are fasteners and screws the same thing? No, screws are one type of fastener, but not all fasteners are screws. Fasteners include a broad range of components such as bolts, nuts, washers, rivets, inserts, and spacers. While screws create or engage threads to hold materials together, specialized fasteners provide additional options for joining, locking, sealing, and supporting assemblies. What is the difference between screws, studs, and standoffs? Screws are threaded fasteners that cut or engage threads in materials for secure joints. Studs are threaded rods, often with threads on both ends, used to join components with nuts or tapped holes, providing strong load-bearing connections. Standoffs, sometimes called threaded spacers, maintain a fixed distance between components — commonly in electronics — to ensure alignment, insulation, and structural support. Specialized fasteners are designed for specific substrates such as plastics, sheet metal, or composites, and are optimized for strength, reliability, and assembly efficiency. Unlike standard screws or bolts, they solve unique engineering challenges by ensuring secure joints that resist vibration, wear, and environmental stress. PSM’s specialized fastening solutions are widely used in automotive, aerospace, electronics, telecommunications, and consumer products. These industries rely on precision-engineered fasteners to ensure structural integrity, reduce assembly costs, and maintain performance under demanding operating conditions. Selecting the correct fastener starts with identifying the substrate material, the installation method, and the required performance characteristics such as torque or pull-out strength. Consulting PSM’s technical datasheets or working with our Application Engineers ensures you select the most suitable specialized fastening solution for your project. No, screws are one type of fastener, but not all fasteners are screws. Fasteners include a broad range of components such as bolts, nuts, washers, rivets, inserts, and spacers. While screws create or engage threads to hold materials together, specialized fasteners provide additional options for joining, locking, sealing, and supporting assemblies. Screws are threaded fasteners that cut or engage threads in materials for secure joints. Studs are threaded rods, often with threads on both ends, used to join components with nuts or tapped holes, providing strong load-bearing connections. Standoffs, sometimes called threaded spacers, maintain a fixed distance between components — commonly in electronics — to ensure alignment, insulation, and structural support. ## How to Specify Identify the application substrate (e.g. hard thermoplastic, metal sheet, PCB). Choose installation method (ultrasonic, heat, press-in, clinch, self-tap). Select performance criteria (torque, pull-out strength, reusability). Consult technical datasheets or PSM’s Application Engineers for tailored advice. **Enhance Your Assembly with Specialized Fastening Solutions** Get in touch with our team or request a quote today to find the ideal fastening solution for your application. [ Shop Now ](https://psmfasteners.com/product-search/) --- ### [Different Industries](https://psmfasteners.com/different-industries/) **Published:** September 2, 2025 **Author:** PSM Fasteners **Content:** ![PSM blue logo](https://psmfasteners.com/wp-content/uploads/2025/09/PSM-logo.avif) [ Facebook-f ](https://www.facebook.com/psmfasteners/) [ Linkedin ](#) [ Youtube ](#) # Industries We Serve ## Precision Fastening Solutions for Every Sector Different industries present unique demands and challenges. At PSM Fasteners, our nearly 100 years of fastener design and engineering expertise empowers us to deliver solutions tailored to the exact needs of each sector — from automotive to renewable energy and more. ## Different Industries ![](https://psmfasteners.com/wp-content/uploads/2025/09/4.avif)### Automotive With decades of experience, PSM is a trusted partner to automotive OEMs and their supply chains. Our fastening systems are engineered to meet the rigorous standards of safety, durability, and performance in passenger cars and commercial vehicles alike. We collaborate from concept through assembly to provide cost-effective, assembly-ready fasteners. ![consumer electronics](https://psmfasteners.com/wp-content/uploads/2025/09/5.avif)### Consumer Electronics In the fast-paced world of electronics, miniaturization and precision are key. PSM specializes in compact and miniature fasteners—including engineered inserts and screws—designed for tight tolerances and high-performance assemblies in smartphones, tablets, and IoT devices. ![home appliances](https://psmfasteners.com/wp-content/uploads/2025/09/6.avif)### Home Appliances From handheld devices to full-size appliances, we deliver tailored fasteners that meet both form and function requirements in consumer home goods. Our solutions ensure seamless integration, assembly efficiency, and long-term product reliability. ![industrial applications](https://psmfasteners.com/wp-content/uploads/2025/09/7.avif)### Industrial Applications For demanding industrial environments, PSM offers heavy-duty, high-strength fastening solutions built to withstand rugged use. Our products—from clinch fasteners and flange-type systems to heavy-duty bolts—ensure durable, dependable performance in machinery and heavy assemblies. ![medical and healthcare](https://psmfasteners.com/wp-content/uploads/2025/09/8.avif)### Medical & Healthcare Fasteners for medical equipment must meet stringent quality, safety, and compliance standards. PSM provides specially selected materials and precision-engineered components suited for use in healthcare devices and instruments. ![renewable energy](https://psmfasteners.com/wp-content/uploads/2025/09/9.avif)### Renewable Energy Outdoor, high-stress environments are no match for our robust fastening solutions. Designed for wind turbines, solar installations, and other renewable applications, PSM fasteners deliver strength and reliability under the harshest conditions. ![lawn & garden equipment](https://psmfasteners.com/wp-content/uploads/2025/09/10.avif)### Lawn & Garden Equipment Outdoor tools demand resilience against weather and wear. PSM’s fastening solutions for lawn and garden equipment are built for durability, offering long-lasting performance in the elements. ![leisure and adventure gear](https://psmfasteners.com/wp-content/uploads/2025/09/11.avif)### Leisure & Adventure Gear Fasteners used in leisure and adventure equipment—from sports gear to outdoor tech—must be both functional and rugged. PSM delivers fasteners engineered for demanding use, ensuring secure performance on the go. ![infrastructure and construction](https://psmfasteners.com/wp-content/uploads/2025/09/12.avif)### Infrastructure & Construction Our products are engineered to support large-scale infrastructure projects—such as rail, utility, and energy structures—with fastening solutions that ensure safety, longevity, and performance in critical construction environments. ![precision instrument](https://psmfasteners.com/wp-content/uploads/2025/09/13.avif)### Precision Instruments Tolerance and accuracy are paramount in precision tools. PSM offers fasteners that maintain positional stability and precise engagement—critical for instruments ranging from gauging devices to optical equipment. ## Why Choose PSM? ### Engineering Beyond Product We provide consultative support from the earliest design stages through to assembly, ensuring you receive the most effective and economical fastening system. ### Global Footprint, Local Expertise With manufacturing and technical centers across Asia, Europe, North America, and Australia, we deliver fast support and consistent quality wherever you operate. ### Customization Meets Innovation From bespoke fastener geometries to tailored feed systems, PSM is ready to adapt, designing custom solutions that marry innovation with efficiency. ## Request a Quote or Sample Looking for reliable, high-performance fastening solutions? ### Request a Quote Get fast, competitive pricing tailored to your project needs. [ request now ](https://psmfasteners.com/request-a-quote/) ### Download Product Catalogue Explore our full range of fastening solutions in one convenient guide. [ download ](https://drive.google.com/file/d/1DLhbQYl7tbysqWCDVdN92vfA041JD88l/view?usp=drivesdk) ##### Contact Our Team Reach out to our experts for personalised support and advice. [ contact us ](https://psmfasteners.com/contact-us/) ![PSM white logo](https://psmfasteners.com/wp-content/uploads/2025/09/Logo-white-scaled-e1756784652336.avif)Global provider of engineered fastening solutions for decades. We design, manufacture, and distribute specialized fasteners and joining systems, serving industries like automotive, electronics, medical, and beyond. [ Facebook-f ](https://www.facebook.com/psmfasteners/) [ Linkedin ](#) [ Youtube ](#) Quick Links Get In Touch 159 – 163 Victoria Road Marrickville, NSW 2204 - info@psmfasteners.com - +61 2 9026 8383 - 7:30 AM to 4:30 PM © 2025 PSM Fasteners. All rights reserved. Part of the Bulten Group. --- ### [About PSM Fasteners](https://psmfasteners.com/about-us/) **Published:** January 29, 2021 **Author:** PSM Fasteners **Content:** FREE shipping for orders above $250!\* Excluding international shipping Fast Global Shipping Bulk Discounts Over 10,000+ Product Variations Trusted by 100,000+ customers **Fast Global Shipping** **Bulk Discounts** **Over 10,000+ Product Variations** **Trusted by 100,000+ Customers** **Fast Global Shipping** **Bulk Discounts** **Over 10,000+ Product Variations** **Trusted by 100,000+ Customers** # About Us ## ABOUT PSM PSM Fasteners is part of a global network of [PSM International](https://www.rgafasteners-psm.com/) distributors offering customers with fastening solutions from around the world. The PSM group is about over 100 products in more than 10,000 variations for Sheet Metal, Plastics & Electronic Assemblies. The diverse product range includes: 1. [Threaded brass inserts for plastics](https://psmfasteners.com/product-search/inserts-for-plastics) 2. [Riveting and self clinching fasteners for sheet metal](https://psmfasteners.com/product-search/sheet-metal-fasteners) 3. [Direct screw fixing for plastics](https://psmfasteners.com/product-search/direct-screw-fixings-for-plastics-light-alloys) (PT Screws) 4. [Spring steel fasteners](https://psmfasteners.com/product-search/spring-steel-plastic-fasteners) 5. [Special components](https://psmfasteners.com/product-search/fasteners-for-special-materials) including spacers hardened steel inserts and cage nuts ## TECH CENTRE Our dedicated Technical Centre is supported by a team of experienced sales engineers who work closely with clients to ensure the right fastening solution for every application. We understand that no two projects are the same, which is why we offer tailored advice and support throughout the design and production process. Our technical team can assist with: 1. Fastener selection and specification support for your unique requirements. 2. Custom design solutions for complex or high-performance applications. 3. Prototype development and testing, ensuring fasteners meet functional and compliance needs. 4. On-site and remote technical support, helping resolve issues quickly and effectively. With QS 9000 and ISO-certified manufacturing facilities, we deliver consistently high-quality, cost-effective fasteners that meet the needs of modern Australian industries—from manufacturing and automotive to electronics and infrastructure. ## SOLUTIONS We don’t just supply fasteners—we provide complete fastening solutions backed by local service and global expertise. Whether you’re working with plastics, sheet metal, or electrical assemblies, we’re here to support your business with proven solutions. We offer: 1. An extensive product range with thousands of configurations to suit various applications. 2. Custom-engineered components for specialised needs. 3. Reliable logistics and distribution across Australia, ensuring products arrive when and where you need them. 4. Locally focused customer service, supported by our international network. With decades of experience and a strong commitment to quality and innovation, PSM is your trusted partner in fastening solutions across Australia and beyond. What Our Clients Say See what our 15,000+ happy customers say about us. > PSM had been bloody brilliant for our workshop – top-notch fasteners delivered on time, every time. Can’t fault their technical advice either. Cheers! > ![](https://secure.gravatar.com/avatar/bcbaf9cbfdfaaadf879cb30b1c17024340fc77d5b303912177970aae9f664f17?s=120&d=mm&r=g) > [Mick](#) > Rated 4 out of 5 > Stoked with the custom fastener management system PSM set us up with – saved us heaps on stock and downtime. Legends! > [Jess](#) > Rated 4 out of 5 > These fellas know their gear. PSM brass inserts are spot‑on quality, saved us loads of fiddly fixes. Wouldn’t go anywhere else. One loyal customer here. > [Dave](#) > Rated 5 out of 5 --- ### [Order Tracking](https://psmfasteners.com/order-tracking/) **Published:** March 1, 2021 **Author:** PSM Fasteners **Content:** # Order Tracking --- ### [Terms and Conditions](https://psmfasteners.com/terms-and-conditions/) **Published:** April 1, 2021 **Author:** PSM Fasteners **Content:** # Terms & Conditions Effective Date: Aug 31, 2025 Website: [psmfasteners.com](http://psmfasteners.com/) Company: PSM Fasteners Pty Ltd By accessing and using this Website, you agree to comply with the following Terms and Conditions. Please read them carefully before using our Website. If you do not agree with these Terms, you must not use this Website. #### **Use of Website** 1. This Website is provided for information, product browsing, and ordering purposes. 2. You agree not to misuse this Website for unlawful or unauthorised purposes. 3. We may suspend or terminate access if we reasonably believe a user has breached these Terms. #### **Product Information & Availability** 1. We aim to keep product descriptions, pricing, and availability accurate, but errors may occur. 2. All products are subject to availability. We reserve the right to limit quantities or withdraw items at any time. 3. Some images are for illustration purposes only; actual products may vary slightly. #### Orders & Payments 1. By placing an order, you confirm that the information you provide is true, accurate, and complete. 2. Prices are listed in your detected IP address currency. Taxes, duties, and shipping fees will be added at checkout, where applicable. 3. Payments must be made through the approved payment methods on our Website. 4. We reserve the right to cancel or refuse an order if: 1. payment is not received; 2. product availability changes; or 3. there is suspected fraud or misuse. #### Shipping & Delivery 1. Delivery times provided are estimates only and may vary depending on location and carrier. 2. We are not liable for delays outside our reasonable control (e.g., customs clearance, strikes, courier delays). 3. Risk of loss or damage passes to you upon delivery. #### Returns & Refunds 1. Our standard return period is 90 days from the date of purchase, in accordance with Australian Consumer Law (ACL). 2. To qualify for a return: 1. Products must be unused, undamaged, and in original packaging; 2. Proof of purchase must be provided. 3. Custom orders or specially manufactured products may not be returnable unless faulty. 4. Refunds will be processed via the original payment method within a reasonable timeframe. #### Intellectual Property 1. All Website content, including text, images, logos, product data, and software, is the intellectual property of PSM Fasteners Pty Ltd or its licensors. 2. 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In the meantime, if you have any questions, feel free to reach out at **info@psmfasteners.com | [+61 290268383 ](tel:+61290268383)**. --- ### [Promo Category](https://psmfasteners.com/promo-category/) **Published:** February 22, 2021 **Author:** PSM Fasteners **Content:** [](https://psmfasteners.com/product-category/diapers/) ## Neom Care Pack [Shop now](https://psmfasteners.com/product-category/diapers/) [](https://psmfasteners.com/product-category/diapers/) ## Best Diapers to play [Shop Now](https://psmfasteners.com/product-category/diapers/) [](https://psmfasteners.com/product-category/diapers/) ## Best Diapers to play [](https://psmfasteners.com/product-category/diapers/) ## Whito Diapers [](https://psmfasteners.com/product-category/milk-powders/) ## Milk powders up to -50% [](https://psmfasteners.com/product-category/family-care/) ## Ultra soft paper # Shop by type #### Shop by age ## Latest products [![PT 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Custom Manufacturer Request](https://psmfasteners.com/thank-you-for-your-custom-manufacture-request/) **Published:** August 19, 2025 **Author:** PSM Fasteners **Content:** Thank you for submitting your custom manufacture request with us. We truly appreciate the opportunity to review your requirements and explore how we can bring your ideas to life. Our team is currently reviewing the details you’ve provided. We will get back to you shortly with the next steps, including any clarifications needed and a proposed timeline. If you have additional files, drawings, or specifications that could support your request, please feel free to share them with us. --- ### [Request A Quote](https://psmfasteners.com/request-a-quote/) **Published:** July 26, 2025 **Author:** PSM Fasteners --- ### [Shop](https://psmfasteners.com/shop/) **Published:** January 17, 2021 **Author:** PSM Fasteners --- ## Products ### [Inserts For Plastics M3 X 3.8 Taper-X Brass OAL 3.8 PSM02107 (TXBM3X3.8)](https://psmfasteners.com/product/inserts-for-plastics-m3-x-3-8-taper-x-brass-oal-3-8-psm02107-txbm3x3-8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TX series - Has been designed for those instances where fasteners must be installed into a 8? tapered hole. The combination of angled splines and upwardly directed vanes provide high torque and pull-out performance. **Content:** ## Advantages - Designed for use in an 8° tapered hole - High pull out performance - High torque resistance - Flange prevents escape of plastic - Can be installed by heat or ultrasonics - Self-aligning ## Selection of Inserts ![Diagram showing Taper-X single vane insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/single-vane-inserts.png) ![Diagram showing Taper X double vane insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/double-vane-inserts.png) ![Diagram showing Taper X Hole configuration](https://psmfasteners.com/wp-content/uploads/2025/07/taper-x-hole-config.png) ### Single Vane Metric ![Table showing Taper X singe vane insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/single-vane-metric-e1753318982121.png)Other lengths possible on quotation. ### Single Vane Unified ![Table showing Taper X single vane insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/single-vane-unified-e1753319090402.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Double Vane Metric ![Table showing Taper X double vane insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/double-vane-metric-e1753319505391.png)Other lengths possible on quotation. ### Double Vane Unified ![Table showing Taper X double vane insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/double-vane-unified-e1753319621324.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert ![Table showing how to specify Taper X inserts](https://psmfasteners.com/wp-content/uploads/2025/07/tape-x-specs-e1753319841229.png) ## Boss Design Specification #### Hole Preparation The taper on the hole should be 8° inclusive. The insert is tapered for approximately 1/3 of its length and is parallel for the remainder. Note: Blind Holes – hole depth should be a minimum of 1 mm or 0.039 inches greater than the length of the insert to be installed. #### Selection of Insert Type Depending on the depth of the hole, the holding power can be increased significantly by selecting the double vane version. #### Installation The fastener may be installed using either a pre-heating process or using heat generated by ultrasonic vibrations. Where preheating is used care must be exercised to ensure that the fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and could have a detrimental effect on performance. Insert must be installed flush to provide maximum performance. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Taper X Double Vane insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/taper-x-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 3/8 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 3 **Product Special Notes:** OAL 3.8 PSM02107 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 2.2 X 6 Type DG Pan Torx Plus 316 Stainless Steel Epol (WN1542KD22X6S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-2-2-x-6-type-dg-pan-torx-plus-316-stainless-steel-epol-wn1542kd22x6s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KD22X6S6 **Product Size:** 2.2 **Product Special Notes:** EPOL **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 8 Type DG Countersunk Phillips Stainless Steel (WN1543KA30X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-8-type-dg-countersunk-phillips-stainless-steel-wn1543ka30x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1543KA30X8SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 2.5 X 6 Type DG Countersunk Pozi Steel Zinc Plated (WN1543KB25X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-2-5-x-6-type-dg-countersunk-pozi-steel-zinc-plated-wn1543kb25x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1543KB25X6Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 12 Type DG Countersunk Torx Steel Black Zinc Plated (WN1543KC30X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-12-type-dg-countersunk-torx-steel-black-zinc-plated-wn1543kc30x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1543KC30X12ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 16 Type DG Countersunk Torx Steel Black Zinc Plated (WN1543KC30X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-16-type-dg-countersunk-torx-steel-black-zinc-plated-wn1543kc30x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1543KC30X16ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 20 Type DG Countersunk Torx (T10) Steel Zinc Plated (TOL +-0.5) (WN1543KC30X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-20-type-dg-countersunk-torx-t10-steel-zinc-plated-tol-0-5-wn1543kc30x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1543KC30X20Z **Product Size:** 3 **Product Special Notes:** (TOL +-0.5) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 2.5 X 7 Type DG Mush Phillips Steel Black Zinc Plated (WN15MRK25X7DPZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-2-5-x-7-type-dg-mush-phillips-steel-black-zinc-plated-wn15mrk25x7dpzb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 1A6 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Mush **Product PSM Part Number:** WN15MRK25X7DPZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Duro Pan Phillips Steel Zinc Plated (WN1742KA25X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-duro-pan-phillips-steel-zinc-plated-wn1742ka25x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KA25X10Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Duro Pan Pozi Steel Zinc Plated (WN1742KB30X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-duro-pan-pozi-steel-zinc-plated-wn1742kb30x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KB30X10Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Duro Pan Pozi Steel Zinc Plated (WN1742KB30X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-duro-pan-pozi-steel-zinc-plated-wn1742kb30x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KB30X12Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Duro Pan Pozi Steel Zinc Plated (WN1742KB30X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-duro-pan-pozi-steel-zinc-plated-wn1742kb30x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KB30X16Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 18 Duro Pan Pozi Steel Zinc Plated (WN1742KB30X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-18-duro-pan-pozi-steel-zinc-plated-wn1742kb30x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KB30X18Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Duro Pan Pozi Steel Zinc Plated (WN1742KB30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-duro-pan-pozi-steel-zinc-plated-wn1742kb30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KB30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Duro Pan Pozi Steel Zinc Plated (WN1742KB40X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-duro-pan-pozi-steel-zinc-plated-wn1742kb40x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KB40X10Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 14 Duro Pan Pozi Steel Zinc Plated (WN1742KB50X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-14-duro-pan-pozi-steel-zinc-plated-wn1742kb50x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KB50X14Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 50 Duro Pan Pozi Steel Zinc Plated Altracs (WN1742KB60X50Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-50-duro-pan-pozi-steel-zinc-plated-altracs-wn1742kb60x50z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** DURO-PT SERIES - The cutting notch combined with the profiled thread root gives low installation torques whilst the special thread form provides high stripping torques when used in thermosetting materials. **Content:** ![Duro PT Series](https://psmfasteners.com/wp-content/uploads/2025/07/duro-series.png) The DURO-PT® SCREW is a direct screw fastener for use in thermosetting plastics. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The cutting notch combined with the profiled thread root and special thread form provides low installation and high stripping torques. The efficient removal of cutting debris ensures greatly reduced bursting forces, providing the solution to a common problem associated with conventional self-tapping screws, when used in thermosets. ### Advantages - Reduces stress in thermosetting plastics to an absolute minimum - Wide safety margin between installation and stripping torque - Suitable for all types of thermosetting plastics. - Can be used in thermoplastics with a high fill content (>30%) ## Design Features ### Special Cutting Notch ![Diagram showing a closer look at Duro PT series' Special Cutting Notch](https://psmfasteners.com/wp-content/uploads/2025/07/cutting-notch.png) - Removes 60-80% of material cut during the thread cutting operation - Reduces installation torque - Reduces radial pressure ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Provides space for debris - Reduces radial stress - Reduces installation torque - Increases stripping torque ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) **Boss design depends on the following factors:** 1. Type of thermoset material used 2. The density of the material 3. The amount and type of filler Because of these variables the following recommendations are minimum and maximum guidelines only. ![Table showing minimum and maximum guidelines for Duro PT series](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-table-e1753248943721.png) FOR SPECIFIC APPLICATION ADVICE, CONTACT PSM. ## Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/duro-pt-dimensions-new-1.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ## Size Range #### **Material** Case Hardened Mild Steel #### **Standard Finishes** Zinc Plate and Clear Passivation (Z) Zinc Plate and Chromate (ZC) Zinc Plate and Black Chromate (ZBC) #### **Other Finishes** Possible on quotation [ ![Table showing different lengths of Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/duro-pt-dimensions_enhanced.avif) ### How to Specify ![Table showing how to specify Duro PT screws](https://psmfasteners.com/wp-content/uploads/2025/07/duro-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 50 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** Duro PT **Product Product Type 3:** Pan **Product PSM Part Number:** WN1742KB60X50Z **Product Size:** 6 **Product Special Notes:** ALTRACS **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 20 Pan Torx Plus Steel Zinc Plated Altracs (WN5152,30X20)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-20-pan-torx-plus-steel-zinc-plated-altracs-wn5152-30x20/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN5152,30X20 **Product Size:** 3 **Product Special Notes:** ALTRACS **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8/7 Pan Torx Plus Steel Zinc Plated Ejot Altracs (WN5152,AP30X8/7)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-7-pan-torx-plus-steel-zinc-plated-ejot-altracs-wn5152-ap30x8-7/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8/7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN5152,AP30X8/7 **Product Size:** 3 **Product Special Notes:** EJOT ALTRACS **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 20 Pan Torx Plus Steel Zinc Plated Hns Altracs (WN5152-30X20-Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-20-pan-torx-plus-steel-zinc-plated-hns-altracs-wn5152-30x20-z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 38A5 **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN5152-30X20-Z **Product Size:** 3 **Product Special Notes:** HNS ALTRACS **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 20/9 Pan Torx Plus Stainless Steel Ejot Altracs (WN5152AP30X20/9)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-20-9-pan-torx-plus-stainless-steel-ejot-altracs-wn5152ap30x20-9/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20/9 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN5152AP30X20/9 **Product Size:** 3 **Product Special Notes:** EJOT ALTRACS **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Flange Torx Plus Steel Zinc Plated Ejot Delta #4229108801 (WN5451,25X8)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-flange-torx-plus-steel-zinc-plated-ejot-delta-4229108801-wn5451-25x8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** RES **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN5451,25X8 **Product Size:** 2.5 **Product Special Notes:** EJOT DELTA #4229108801 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Flange Torx Plus Steel Zinc Plated Delta Rnd/Washer (8IP) (WN5451KC25X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-flange-torx-plus-steel-zinc-plated-delta-rnd-washer-8ip-wn5451kc25x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 10C8 **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN5451KC25X8Z **Product Size:** 2.5 **Product Special Notes:** DELTA RND/WASHER (8IP) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 16 Pan Flange Torx Stainless Steel Delta (WN5451KC60X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-16-pan-flange-torx-stainless-steel-delta-wn5451kc60x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN5451KC60X16SS **Product Size:** 6 **Product Special Notes:** DELTA **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.0 X 7 Pan Torx (T6) Steel Zinc Plated Delta (HD3.3) (WN5452KC20X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-0-x-7-pan-torx-t6-steel-zinc-plated-delta-hd3-3-wn5452kc20x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN5452KC20X7Z **Product Size:** 2 **Product Special Notes:** DELTA (HD3.3) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 7 Pan Torx (T6) Steel Zinc Plated Delta (T6) 100% Inspect (WN5452KC22X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-7-pan-torx-t6-steel-zinc-plated-delta-t6-100-inspect-wn5452kc22x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** RES **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN5452KC22X7Z **Product Size:** 2.2 **Product Special Notes:** DELTA (T6) 100% INSPECT **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 7 Type DG Pan Torx Steel Black Zinc Plated (WN1542KC30X7ZBC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-7-type-dg-pan-torx-steel-black-zinc-plated-wn1542kc30x7zbc/) **Published:** May 8, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC30X7ZBC **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Countersunk Pozi Steel Black Zinc Plated (WN1443KB25X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-countersunk-pozi-steel-black-zinc-plated-wn1443kb25x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB25X6ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Countersunk Pozi Steel Zinc Plated (WN1443KB25X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-countersunk-pozi-steel-zinc-plated-wn1443kb25x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB25X8Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Countersunk Pozi Steel Zinc Plated (WN1443KB30X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-countersunk-pozi-steel-zinc-plated-wn1443kb30x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB30X16Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 18 Countersunk Pozi Steel Zinc Plated (WN1443KB30X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-18-countersunk-pozi-steel-zinc-plated-wn1443kb30x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB30X18Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Countersunk Pozi Steel Zinc Plated (WN1443KB30X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-countersunk-pozi-steel-zinc-plated-wn1443kb30x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB30X25Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Countersunk Pozi Steel Zinc Plated (WN1443KB30X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-countersunk-pozi-steel-zinc-plated-wn1443kb30x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB30X6Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Countersunk Pozi Steel Zinc Plated (WN1443KB30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-countersunk-pozi-steel-zinc-plated-wn1443kb30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Countersunk Pozi Steel Black Zinc Plated (WN1443KB30X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-countersunk-pozi-steel-black-zinc-plated-wn1443kb30x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB30X8ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Countersunk Pozi Steel Zinc Plated (WN1443KB35X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-countersunk-pozi-steel-zinc-plated-wn1443kb35x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB35X10Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 8 Countersunk Pozi Steel Zinc Plated (WN1443KB35X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-8-countersunk-pozi-steel-zinc-plated-wn1443kb35x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB35X8Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 20 Pan Phillips Steel Black Zinc Plated (WN1442KA22X20ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-20-pan-phillips-steel-black-zinc-plated-wn1442ka22x20zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KA22X20ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Pan Phillips Steel Zinc Plated (WN1442KA30X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-pan-phillips-steel-zinc-plated-wn1442ka30x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KA30X25Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 30 Pan Phillips Steel Zinc Plated (WN1442KA40X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-30-pan-phillips-steel-zinc-plated-wn1442ka40x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KA40X30Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Pan Pozi Steel Zinc Plated (WN1442KB18X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-pan-pozi-steel-zinc-plated-wn1442kb18x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB18X5Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 6 Pan Pozi Steel Zinc Plated (WN1442KB18X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-6-pan-pozi-steel-zinc-plated-wn1442kb18x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB18X6Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 20 Pan Pozi Steel Zinc Plated (WN1442KB22X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-20-pan-pozi-steel-zinc-plated-wn1442kb22x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB22X20Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 5 Pan Pozi Steel Zinc Plated (WN1442KB22X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-5-pan-pozi-steel-zinc-plated-wn1442kb22x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB22X5Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Pan Pozi Steel Zinc Plated (WN1442KB22X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-pan-pozi-steel-zinc-plated-wn1442kb22x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB22X6Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 20 Pan Pozi Steel Zinc Plated (WN1442KB25X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-20-pan-pozi-steel-zinc-plated-wn1442kb25x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB25X20Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 22 Pan Pozi Steel Zinc Plated (WN1442KB25X22Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-22-pan-pozi-steel-zinc-plated-wn1442kb25x22z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 22 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB25X22Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 22 Pan Pozi Steel Black Zinc Plated (WN1442KB25X22ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-22-pan-pozi-steel-black-zinc-plated-wn1442kb25x22zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 22 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB25X22ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 30 Pan Pozi Steel Zinc Plated (WN1442KB25X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-30-pan-pozi-steel-zinc-plated-wn1442kb25x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB25X30Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 7 Pan Pozi Steel Zinc Plated (WN1442KB25X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-7-pan-pozi-steel-zinc-plated-wn1442kb25x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB25X7Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Pozi Steel Zinc Plated (WN1442KB25X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-pozi-steel-zinc-plated-wn1442kb25x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB25X8Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 14 Pan Pozi Steel Zinc Plated (WN1442KB3.5X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-14-pan-pozi-steel-zinc-plated-wn1442kb3-5x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB3.5X14Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Pozi Steel Zinc Plated RBA # 2263435302 (WN1442KB30X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-pozi-steel-zinc-plated-rba-2263435302-wn1442kb30x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB30X12Z **Product Size:** 3 **Product Special Notes:** RBA # 2263435302 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Pozi Steel Zinc Plated (WN1442KB35X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-pozi-steel-zinc-plated-wn1442kb35x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X10Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Pan Pozi Steel Zinc Plated (WN1442KB35X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-pozi-steel-zinc-plated-wn1442kb35x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X12Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 14 Pan Pozi Bo (WN1442KB35X14BO)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-14-pan-pozi-bo-wn1442kb35x14bo/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X14BO **Product Size:** 3.5 **Product Special Notes:** BO **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 14 Pan Pozi Steel Zinc Plated (WN1442KB35X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-14-pan-pozi-steel-zinc-plated-wn1442kb35x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X14Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Pan Pozi Steel Zinc Plated (WN1442KB35X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-pan-pozi-steel-zinc-plated-wn1442kb35x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X16Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 20 Pan Pozi Steel Zinc Plated (WN1442KB35X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-20-pan-pozi-steel-zinc-plated-wn1442kb35x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X20Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 22 Pan Pozi Steel Zinc Plated (WN1442KB35X22Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-22-pan-pozi-steel-zinc-plated-wn1442kb35x22z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 22 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X22Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 7 Pan Pozi Steel Zinc Plated (WN1442KB35X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-7-pan-pozi-steel-zinc-plated-wn1442kb35x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X7Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 8 Pan Pozi Steel Zinc Plated (HD 6.9) (WN1442KB35X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-8-pan-pozi-steel-zinc-plated-hd-6-9-wn1442kb35x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB35X8Z **Product Size:** 3.5 **Product Special Notes:** (HD 6.9) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Pozi Steel Zinc Plated (WN1442KB40X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-pozi-steel-zinc-plated-wn1442kb40x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB40X12Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 14 Pan Pozi Steel Zinc Plated (WN1442KB40X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-14-pan-pozi-steel-zinc-plated-wn1442kb40x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB40X14Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 18 Pan Pozi Steel Zinc Plated (WN1442KB40X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-18-pan-pozi-steel-zinc-plated-wn1442kb40x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB40X18Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Pan Pozi Steel Zinc Plated (WN1442KB40X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-pan-pozi-steel-zinc-plated-wn1442kb40x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB40X20Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 30 Pan Pozi Steel Zinc Plated (WN1442KB40X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-30-pan-pozi-steel-zinc-plated-wn1442kb40x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB40X30Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 35 Pan Pozi Steel Zinc Plated (WN1442KB40X35Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-35-pan-pozi-steel-zinc-plated-wn1442kb40x35z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB40X35Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Pozi Steel Zinc Plated (WN1442KB4X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-pozi-steel-zinc-plated-wn1442kb4x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB4X12Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 25 Pan Pozi Steel Zinc Plated (WN1442KB4X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-25-pan-pozi-steel-zinc-plated-wn1442kb4x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB4X25Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 20 Pan Pozi Steel Zinc Plated (WN1442KB50X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-20-pan-pozi-steel-zinc-plated-wn1442kb50x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB50X20Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 30 Pan Pozi Steel Zinc Plated (WN1442KB50X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-30-pan-pozi-steel-zinc-plated-wn1442kb50x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB50X30Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 45 Pan Pozi Steel Zinc Plated (WN1442KB50X45Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-45-pan-pozi-steel-zinc-plated-wn1442kb50x45z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KB50X45Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 20 Pan Torx Steel Zinc Plated (WN1442KC25X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-20-pan-torx-steel-zinc-plated-wn1442kc25x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KC25X20Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Torx Steel Black Zinc Plated (WN1442KC30X10L)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-torx-steel-black-zinc-plated-wn1442kc30x10l/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KC30X10L **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 10 Countersunk Pozi Steel Zinc Plated (WN1443KB22X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-10-countersunk-pozi-steel-zinc-plated-wn1443kb22x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB22X10Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 12 Countersunk Pozi Steel Zinc Plated (WN1443KB22X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-12-countersunk-pozi-steel-zinc-plated-wn1443kb22x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB22X12Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Countersunk Pozi Steel Zinc Plated (WN1443KB22X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-countersunk-pozi-steel-zinc-plated-wn1443kb22x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB22X8Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 12 Countersunk Pozi Steel Zinc Plated (WN1443KB25X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-12-countersunk-pozi-steel-zinc-plated-wn1443kb25x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB25X12Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Countersunk Pozi Steel Zinc Plated (WN1443KB25X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-countersunk-pozi-steel-zinc-plated-wn1443kb25x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB25X6Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Countersunk Pozi Steel Zinc Plated (WN1443KB35X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-countersunk-pozi-steel-zinc-plated-wn1443kb35x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB35X12Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 18 Countersunk Pozi Steel Zinc Plated (WN1443KB35X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-18-countersunk-pozi-steel-zinc-plated-wn1443kb35x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB35X18Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 20 Countersunk Pozi Steel Zinc Plated (WN1443KB35X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-20-countersunk-pozi-steel-zinc-plated-wn1443kb35x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB35X20Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Countersunk Pozi Steel Zinc Plated (WN1443KB40X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-countersunk-pozi-steel-zinc-plated-wn1443kb40x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 40B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1443KB40X10Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Slot Steel Zinc Plated (WN1445K30X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-slot-steel-zinc-plated-wn1445k30x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Slot **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1445K30X6Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 14 Flange Hex Steel Zinc Plated (WN1447K40X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-14-flange-hex-steel-zinc-plated-wn1447k40x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Hex **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Flange Hex **Product PSM Part Number:** WN1447K40X14Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 12 Flange Hex S301 Silver Grey Ctd (WN1447K50X12DS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-12-flange-hex-s301-silver-grey-ctd-wn1447k50x12ds/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Hex **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Flange Hex **Product PSM Part Number:** WN1447K50X12DS **Product Size:** 5 **Product Special Notes:** S301 SILVER GREY CTD **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 12 Flange Hex Steel Black Zinc Plated (WN1447K60X12-XL)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-12-flange-hex-steel-black-zinc-plated-wn1447k60x12-xl/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Hex **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Flange Hex **Product PSM Part Number:** WN1447K60X12-XL **Product Size:** 6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 8.0 X 20 Flange Hex Steel Nickel Black Plated (WN1447K80X20ZNB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-8-0-x-20-flange-hex-steel-nickel-black-plated-wn1447k80x20znb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Hex **Product Finish:** Nickel Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Flange Hex **Product PSM Part Number:** WN1447K80X20ZNB **Product Size:** 8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Flange Hex Steel Zinc Plated (2)NIB Z/P AF7.0 (WN1447KA40X10SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-flange-hex-steel-zinc-plated-2nib-z-p-af7-0-wn1447ka40x10sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Hex **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Flange Hex **Product PSM Part Number:** WN1447KA40X10SP **Product Size:** 4 **Product Special Notes:** (2)NIB Z/P AF7.0 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.2 X 3.17 Pan Torx Steel Zinc Plated 3Ip (WN1452KC12X3.17)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-2-x-3-17-pan-torx-steel-zinc-plated-3ip-wn1452kc12x3-17/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3.17 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1452KC12X3.17 **Product Size:** 1.2 **Product Special Notes:** 3IP **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 10 Pan Torx Plus Steel Zinc Plated (WN1452KD22X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-10-pan-torx-plus-steel-zinc-plated-wn1452kd22x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1452KD22X10Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 4.0 X 14 Type DG Pan Phillips Steel Black Zinc Plated (WN1542KA40X14ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-4-0-x-14-type-dg-pan-phillips-steel-black-zinc-plated-wn1542ka40x14zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KA40X14ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 2.2 X 10 Type DG Pan Pozi Steel Zinc Plated (WN1542KB22X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-2-2-x-10-type-dg-pan-pozi-steel-zinc-plated-wn1542kb22x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KB22X10Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 8 Type DG Pan Pozi Steel Zinc Plated (WN1542KB30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-8-type-dg-pan-pozi-steel-zinc-plated-wn1542kb30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KB30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 2.5 X 5.5 Type DG Pan Torx (T8) Steel Zinc Plated (WN1542KC25X5.5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-2-5-x-5-5-type-dg-pan-torx-t8-steel-zinc-plated-wn1542kc25x5-5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T8) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5.5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC25X5.5Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 7 Type DG Pan Torx Steel Nickel Black Plated (WN1542KC30X7-NB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-7-type-dg-pan-torx-steel-nickel-black-plated-wn1542kc30x7-nb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** RES **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Nickel Black Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC30X7-NB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 7 Type DG Pan Torx Steel Black Zinc Plated HD=7 (WN1542KC30X7SPE)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-7-type-dg-pan-torx-steel-black-zinc-plated-hd-7-wn1542kc30x7spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC30X7SPE **Product Size:** 3 **Product Special Notes:** HD=7 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.0 X 7 Type DG Pan Torx Steel Zinc Plated (WN1542KC30X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-0-x-7-type-dg-pan-torx-steel-zinc-plated-wn1542kc30x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B1 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC30X7Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 3.5 X 12 Type DG Pan Torx Stainless Steel (WN1542KC35X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-3-5-x-12-type-dg-pan-torx-stainless-steel-wn1542kc35x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC35X12SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 4.0 X 14 Type DG Pan Torx Steel Nickel Black Plated Gmw4700 (WN1542KC4014ZNB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-4-0-x-14-type-dg-pan-torx-steel-nickel-black-plated-gmw4700-wn1542kc4014znb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Nickel Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC4014ZNB **Product Size:** 4 **Product Special Notes:** GMW4700 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 4.0 X 14 Type DG Pan Torx Steel Zinc Plated (WN1542KC40X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-4-0-x-14-type-dg-pan-torx-steel-zinc-plated-wn1542kc40x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC40X14Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Light Alloys 4.0 X 18 Type DG Pan Torx Steel Zinc Plated (WN1542KC40X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-light-alloys-4-0-x-18-type-dg-pan-torx-steel-zinc-plated-wn1542kc40x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT TYPE DG - Developed to provide an effective screw fixing in light alloy materials with low installation torque and high stripping torque. **Content:** ![](https://psmfasteners.com/wp-content/uploads/2025/05/pt-type-DG-resized2.avif) The PT® TYPE DG is a direct screw fastener for use in light alloys. The design incorporates many unique features which provide designers with a really effective direct screw fixing for these materials. The profiled thread root gives low installation torque whilst the special thread form provides high stripping torque. ### Advantages - Thread forming – No debris - Reliable & easy installation into punched, drilled, extruded & molded holes - Reusability of screw ## Design Features ### Special Profiled Root ![Diagram showing a closer look at Duro PT series' Special Profiled Root](https://psmfasteners.com/wp-content/uploads/2025/07/profiled-root-e1753248147909.png) - Reduces stress - Allows material to flow during thread forming - Reduces installation torque - Increases pull-out load ### Special Shaped Tooth ![Diagram showing angle of Duro PT series' special shaped tooth](https://psmfasteners.com/wp-content/uploads/2025/07/special-shaped-tooth-e1753248364968.png) - Reduces radial stress - Maximum surface bearing area - High stripping torque - High clamping force - High back-off torque ## Design Guide ![Table showing PT Type DG dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/DG-table-e1753250925136.png) ![Diagram showing extruded hole and punch hole measurements](https://psmfasteners.com/wp-content/uploads/2025/07/DG-design-guide.png) ![Diagram showing Duro PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide-duro-e1753248562919.png) Soft materials = ≤ 50 vpn Medium soft materials = 51 to 75 vpn Hard materials = 76 to 100 vpn For specific application advice, contact PSM. ## Dimensions ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-dimensions-new-1-1024x778.avif) ## Size Range ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-type-dg-table-2-e1759829554581.avif) #### Material Through hardened & tempered steel #### Standard Finishes - Zinc Plate and Clear Passivation (Z) - Zinc Plate and Chromate (ZC) - Zinc Plate and Black Chromate (ZBC) - Stainless Steel (SS) - Stainless Steel 316 (S6) #### Other Finishes Available to order ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® ### How to Specify ![Table showing how to specify PT type DG screws](https://psmfasteners.com/wp-content/uploads/2025/07/DG-specs.png) **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Type DG **Product Product Type 3:** Pan **Product PSM Part Number:** WN1542KC40X18Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Countersunk Pozi Stainless Steel Black Plated (WN1413KB30X10SS-BZ)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-countersunk-pozi-stainless-steel-black-plated-wn1413kb30x10ss-bz/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X10SS-BZ **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Countersunk Pozi Stainless Steel (WN1413KB30X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-countersunk-pozi-stainless-steel-wn1413kb30x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X10SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Countersunk Pozi Steel Zinc Plated (WN1413KB30X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-countersunk-pozi-steel-zinc-plated-wn1413kb30x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X10Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Countersunk Pozi Steel Black Zinc Plated (WN1413KB30X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-countersunk-pozi-steel-black-zinc-plated-wn1413kb30x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X10ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Countersunk Pozi Stainless Steel Black Plated (WN1413KB30X12SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-countersunk-pozi-stainless-steel-black-plated-wn1413kb30x12sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X12SB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Countersunk Pozi Stainless Steel (WN1413KB30X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-countersunk-pozi-stainless-steel-wn1413kb30x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X12SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Countersunk Pozi Steel Zinc Plated (WN1413KB30X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-countersunk-pozi-steel-zinc-plated-wn1413kb30x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X12Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Countersunk Pozi Steel Black Zinc Plated (WN1413KB30X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-countersunk-pozi-steel-black-zinc-plated-wn1413kb30x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X12ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Countersunk Pozi Steel Zinc Plated (WN1413KB30X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-countersunk-pozi-steel-zinc-plated-wn1413kb30x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X14Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Countersunk Pozi Steel Black Zinc Plated (WN1413KB30X14ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-countersunk-pozi-steel-black-zinc-plated-wn1413kb30x14zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X14ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 22.5 Countersunk Pozi Steel Zinc Plated (WN1413KB30X22.5)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-22-5-countersunk-pozi-steel-zinc-plated-wn1413kb30x22-5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 22.5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X22.5 **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 22 Countersunk Pozi Stainless Steel (WN1413KB30X22SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-22-countersunk-pozi-stainless-steel-wn1413kb30x22ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 22 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X22SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Countersunk Pozi Steel Black Zinc Plated (WN1413KB30X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-countersunk-pozi-steel-black-zinc-plated-wn1413kb30x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X6ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 7 Countersunk Pozi Steel Zinc Plated (WN1413KB30X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-7-countersunk-pozi-steel-zinc-plated-wn1413kb30x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X7Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 7 Countersunk Pozi Steel Black Zinc Plated (WN1413KB30X7ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-7-countersunk-pozi-steel-black-zinc-plated-wn1413kb30x7zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X7ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Countersunk Pozi Steel Yellow Zinc Plated Fe/Zn 8 MIC/MTM#P6235 (WN1413KB30X8-ZC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-countersunk-pozi-steel-yellow-zinc-plated-fe-zn-8-mic-mtmp6235-wn1413kb30x8-zc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X8-ZC **Product Size:** 3 **Product Special Notes:** FE/ZN 8 MIC/MTM#P6235 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Countersunk Pozi Stainless Steel (WN1413KB35X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-countersunk-pozi-stainless-steel-wn1413kb35x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB35X10SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Countersunk Pozi Steel Zinc Plated (WN1413KB35X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-countersunk-pozi-steel-zinc-plated-wn1413kb35x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB35X12Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 14 Countersunk Pozi Steel Zinc Plated (WN1413KB35X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-14-countersunk-pozi-steel-zinc-plated-wn1413kb35x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB35X14Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Countersunk Pozi Steel Zinc Plated (WN1413KB35X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-countersunk-pozi-steel-zinc-plated-wn1413kb35x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB35X16Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 35 Countersunk Pozi Steel Zinc Plated 20MM Thread (WN1413KB35X35Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-35-countersunk-pozi-steel-zinc-plated-20mm-thread-wn1413kb35x35z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB35X35Z **Product Size:** 3.5 **Product Special Notes:** 20mm thread **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 40 Countersunk Pozi Steel Zinc Plated (WN1413KB35X40Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-40-countersunk-pozi-steel-zinc-plated-wn1413kb35x40z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB35X40Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Countersunk Pozi Steel Zinc Plated (WN1413KB40X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-countersunk-pozi-steel-zinc-plated-wn1413kb40x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X10Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Countersunk Pozi Steel Black Zinc Plated (WN1413KB40X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-countersunk-pozi-steel-black-zinc-plated-wn1413kb40x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X10ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Countersunk Pozi Steel Zinc Plated (WN1413KB40X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-countersunk-pozi-steel-zinc-plated-wn1413kb40x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X12Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 14 Countersunk Pozi Steel Black Zinc Plated (WN1413KB40X14ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-14-countersunk-pozi-steel-black-zinc-plated-wn1413kb40x14zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X14ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Countersunk Pozi Steel Zinc Plated (WN1413KB40X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-countersunk-pozi-steel-zinc-plated-wn1413kb40x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X16Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Countersunk Pozi Steel Zinc Plated (WN1413KB40X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-countersunk-pozi-steel-zinc-plated-wn1413kb40x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X20Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Countersunk Pozi Steel Yellow Zinc Plated (WN1413KB40X20ZC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-countersunk-pozi-steel-yellow-zinc-plated-wn1413kb40x20zc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X20ZC **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 25 Countersunk Pozi Steel Zinc Plated (WN1413KB40X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-25-countersunk-pozi-steel-zinc-plated-wn1413kb40x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X25Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 30 Countersunk Pozi Steel Zinc Plated (WN1413KB40X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-30-countersunk-pozi-steel-zinc-plated-wn1413kb40x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X30Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Countersunk Pozi Steel Zinc Plated (WN1413KB40X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-countersunk-pozi-steel-zinc-plated-wn1413kb40x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB40X8Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 10 Countersunk Pozi Steel Black Zinc Plated (WN1413KB50X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-10-countersunk-pozi-steel-black-zinc-plated-wn1413kb50x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB50X10ZB **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 20 Countersunk Pozi Steel Zinc Plated (WN1413KB50X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-20-countersunk-pozi-steel-zinc-plated-wn1413kb50x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB50X20Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 25 Countersunk Pozi Stainless Steel Black Plated (WN1413KB50X25SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-25-countersunk-pozi-stainless-steel-black-plated-wn1413kb50x25sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB50X25SB **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 25 Countersunk Pozi Steel Black Zinc Plated (WN1413KB50X25ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-25-countersunk-pozi-steel-black-zinc-plated-wn1413kb50x25zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB50X25ZB **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 30 Countersunk Pozi Steel Zinc Plated (WN1413KB50X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-30-countersunk-pozi-steel-zinc-plated-wn1413kb50x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB50X30Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Countersunk Torx Steel Zinc Plated (WN1413KC18X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-countersunk-torx-steel-zinc-plated-wn1413kc18x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 3B2 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC18X5Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Countersunk Torx Steel Black Zinc Plated (WN1413KC18X5ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-countersunk-torx-steel-black-zinc-plated-wn1413kc18x5zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 3B2 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC18X5ZB **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 8 Countersunk Torx Steel Black Zinc Plated (WN1413KC18X8-ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-8-countersunk-torx-steel-black-zinc-plated-wn1413kc18x8-zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B2 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC18X8-ZB **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 14 Countersunk Torx Steel Zinc Plated (WN1413KC25X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-14-countersunk-torx-steel-zinc-plated-wn1413kc25x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC25X14Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 16 Countersunk Torx Steel Zinc Plated (WN1413KC25X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-16-countersunk-torx-steel-zinc-plated-wn1413kc25x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC25X16Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Countersunk Torx Steel Black Zinc Plated (WN1413KC30X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-countersunk-torx-steel-black-zinc-plated-wn1413kc30x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X10ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Countersunk Torx (T8) Steel Nickel Black Plated Cu Base (WN1413KC30X12NB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-countersunk-torx-t8-steel-nickel-black-plated-cu-base-wn1413kc30x12nb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 38A2 **Product Default Location:** PSM **Product Drive Size:** (T8) **Product Drive Type:** Torx **Product Finish:** Nickel Black Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X12NB **Product Size:** 3 **Product Special Notes:** CU BASE **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Countersunk Torx Steel Zinc Plated (WN1413KC30X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-countersunk-torx-steel-zinc-plated-wn1413kc30x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X12Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Countersunk Torx (T8) Steel Black Zinc Plated (WN1413KC30X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-countersunk-torx-t8-steel-black-zinc-plated-wn1413kc30x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Size:** (T8) **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X12ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Countersunk Torx Steel Zinc Plated (WN1413KC30X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-countersunk-torx-steel-zinc-plated-wn1413kc30x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30x14Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Countersunk Torx Steel Black Zinc Plated (WN1413KC30X14ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-countersunk-torx-steel-black-zinc-plated-wn1413kc30x14zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X14ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Countersunk Torx (T8) Stainless Steel (WN1413KC30X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-countersunk-torx-t8-stainless-steel-wn1413kc30x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T8) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X16SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Countersunk Torx Steel Zinc Plated (WN1413KC30X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-countersunk-torx-steel-zinc-plated-wn1413kc30x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X16Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Countersunk Torx Steel Zinc Plated (WN1413KC30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-countersunk-torx-steel-zinc-plated-wn1413kc30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Countersunk Torx Steel Black Zinc Plated (WN1413KC30X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-countersunk-torx-steel-black-zinc-plated-wn1413kc30x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC30X8ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Countersunk Torx (T10) Steel Zinc Plated (WN1413KC35X10SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-countersunk-torx-t10-steel-zinc-plated-wn1413kc35x10sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC35X10SP **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 14 Countersunk Torx (T10) Steel Zinc Plated (WN1413KC35X14SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-14-countersunk-torx-t10-steel-zinc-plated-wn1413kc35x14sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC35X14SP **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Countersunk Torx Steel Dcb(S424)Black (WN1413KC40X16DB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-countersunk-torx-steel-dcbs424black-wn1413kc40x16db/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC40X16DB **Product Size:** 4 **Product Special Notes:** DCB(S424)BLACK **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Countersunk Torx Steel Zinc Plated Pl # PSM49549-Cui (WN1413KC40X16SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-countersunk-torx-steel-zinc-plated-pl-psm49549-cui-wn1413kc40x16sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC40X16SP **Product Size:** 4 **Product Special Notes:** PL # PSM49549-CUI **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Countersunk Torx (T20) Steel Zinc Plated (WN1413KC40X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-countersunk-torx-t20-steel-zinc-plated-wn1413kc40x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T20) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC40X16Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 18 Countersunk Torx Stainless Steel (WN1413KC40X18SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-18-countersunk-torx-stainless-steel-wn1413kc40x18ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC40X18SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 25 Countersunk Torx Stainless Steel (WN1413KC50X25SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-25-countersunk-torx-stainless-steel-wn1413kc50x25ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC50X25SS **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 7.0 X 35 Countersunk Torx (T40) Steel Mechanical Galvanised (WN1413KC70X35MG)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-7-0-x-35-countersunk-torx-t40-steel-mechanical-galvanised-wn1413kc70x35mg/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T40) **Product Drive Type:** Torx **Product Finish:** Mechanical Galvanised **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC70X35MG **Product Size:** 7 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 7.0 X 55 Countersunk Torx (T40) Steel Mechanical Galvanised 25UM (WN1413KC70X55MG)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-7-0-x-55-countersunk-torx-t40-steel-mechanical-galvanised-25um-wn1413kc70x55mg/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T40) **Product Drive Type:** Torx **Product Finish:** Mechanical Galvanised **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 55 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC70X55MG **Product Size:** 7 **Product Special Notes:** 25um **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 7.0 X 75 Countersunk Torx (T40) Steel Mechanical Galvanised 25UM (WN1413KC70X75MG)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-7-0-x-75-countersunk-torx-t40-steel-mechanical-galvanised-25um-wn1413kc70x75mg/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T40) **Product Drive Type:** Torx **Product Finish:** Mechanical Galvanised **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 75 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KC70X75MG **Product Size:** 7 **Product Special Notes:** 25um **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Countersunk Torx Pin Steel Black Zinc Plated (WN1413KDR30X16B)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-countersunk-torx-pin-steel-black-zinc-plated-wn1413kdr30x16b/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KDR30X16B **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Flange Phillips Steel Zinc Plated (WN1441KA25X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-flange-phillips-steel-zinc-plated-wn1441ka25x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KA25X6Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Pan Flange Phillips Steel Zinc Plated (WN1441KA3.5X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-pan-flange-phillips-steel-zinc-plated-wn1441ka3-5x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KA3.5X16Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Flange Pozi Steel Zinc Plated (WN1441KB25X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-flange-pozi-steel-zinc-plated-wn1441kb25x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB25X6Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Flange Pozi Steel Zinc Plated (WN1441KB30X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-flange-pozi-steel-zinc-plated-wn1441kb30x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB30X10Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Flange Pozi Steel Zinc Plated (WN1441KB30X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-flange-pozi-steel-zinc-plated-wn1441kb30x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB30X12Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Pan Flange Pozi Steel Zinc Plated (WN1441KB30X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-pan-flange-pozi-steel-zinc-plated-wn1441kb30x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB30X16Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 20 Pan Flange Pozi Steel Zinc Plated (WN1441KB30X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-20-pan-flange-pozi-steel-zinc-plated-wn1441kb30x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB30X20Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Pan Flange Pozi Steel Zinc Plated (WN1441KB30X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-pan-flange-pozi-steel-zinc-plated-wn1441kb30x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB30X25Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Flange Pozi Steel Zinc Plated (WN1441KB30X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-flange-pozi-steel-zinc-plated-wn1441kb30x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB30X6Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Flange Pozi Steel Zinc Plated (WN1441KB35X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-flange-pozi-steel-zinc-plated-wn1441kb35x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB35X10Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Flange Pozi Steel Zinc Plated (WN1441KB40X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-flange-pozi-steel-zinc-plated-wn1441kb40x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB40X10Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Flange Pozi Steel Zinc Plated (WN1441KB40X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-flange-pozi-steel-zinc-plated-wn1441kb40x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB40X12Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Flange Pozi Steel Zinc Plated (WN1441KB40X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-flange-pozi-steel-zinc-plated-wn1441kb40x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KB40X8Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 7 Pan Flange Torx Steel Zinc Plated (WN1441KC25X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-7-pan-flange-torx-steel-zinc-plated-wn1441kc25x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1441KC25X7Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 8 Pan Phillips Steel Zinc Plated (WN1442KA18X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-8-pan-phillips-steel-zinc-plated-wn1442ka18x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KA18X8Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 5 Pan Phillips Steel Zinc Plated (WN1442KA2.2X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-5-pan-phillips-steel-zinc-plated-wn1442ka2-2x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1442KA2.2X5Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Torx (T10) Steel Black Zinc Plated (WN1412KC30X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-torx-t10-steel-black-zinc-plated-wn1412kc30x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B3 **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X8ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Torx Steel Black Zinc Plated (WN1412KC3510BTZ)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-torx-steel-black-zinc-plated-wn1412kc3510btz/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC3510BTZ **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Pan Torx 316 Stainless Steel (WN1412KC35X12S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-torx-316-stainless-steel-wn1412kc35x12s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X12S6 **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Pan Torx 316 Stainless Steel (WN1412KC3512S6B)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-torx-316-stainless-steel-wn1412kc3512s6b/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC3512S6B **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Torx (T6) Stainless Steel (WN1412KC35X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-torx-t6-stainless-steel-wn1412kc35x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A5 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X10SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Torx (T6) Steel Zinc Plated (WN1412KC35X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-torx-t6-steel-zinc-plated-wn1412kc35x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X10Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Torx Steel Black Zinc Plated (WN1412KC35X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-torx-steel-black-zinc-plated-wn1412kc35x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X10ZB **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Pan Torx Stainless Steel (WN1412KC35X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-torx-stainless-steel-wn1412kc35x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X12SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Pan Torx Steel Zinc Plated (WN1412KC35X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-torx-steel-zinc-plated-wn1412kc35x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X12Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 14 Pan Torx Stainless Steel (WN1412KC35X14SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-14-pan-torx-stainless-steel-wn1412kc35x14ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X14SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 14 Pan Torx Steel Zinc Plated (WN1412KC35X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-14-pan-torx-steel-zinc-plated-wn1412kc35x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X14Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 7 Pan Torx (T6) Steel Zinc Plated (WN1412KC35X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-7-pan-torx-t6-steel-zinc-plated-wn1412kc35x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC35X7Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Torx Stainless Steel (WN1412KC40X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-torx-stainless-steel-wn1412kc40x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X10SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Torx Steel Zinc Plated (WN1412KC40X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-torx-steel-zinc-plated-wn1412kc40x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X10Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Torx (T10) Stainless Steel (WN1412KC40X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-torx-t10-stainless-steel-wn1412kc40x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X12SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Torx Steel Zinc Plated (WN1412KC40X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-torx-steel-zinc-plated-wn1412kc40x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B5, 38A4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X12Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Torx Steel Black Zinc Plated (WN1412KC40X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-torx-steel-black-zinc-plated-wn1412kc40x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X12ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 14 Pan Torx Stainless Steel (WN1412KC40X14SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-14-pan-torx-stainless-steel-wn1412kc40x14ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X14SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Torx Stainless Steel (WN1412KC40X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-torx-stainless-steel-wn1412kc40x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X16SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Torx Steel Zinc Plated (WN1412KC40X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-torx-steel-zinc-plated-wn1412kc40x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X16Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Pan Torx (T10) Stainless Steel (WN1412KC40X20SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-pan-torx-t10-stainless-steel-wn1412kc40x20ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X20SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Pan Torx Steel Yellow Zinc Plated (WN1412KC40X20ZD)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-pan-torx-steel-yellow-zinc-plated-wn1412kc40x20zd/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X20ZD **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Torx Stainless Steel (WN1412KC40X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-torx-stainless-steel-wn1412kc40x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X8SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Torx Steel Zinc Plated (WN1412KC40X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-torx-steel-zinc-plated-wn1412kc40x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC40X8Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 10 Pan Torx (T25) Stainless Steel (HD8.8,3.4) (WN1412KC50X10SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-10-pan-torx-t25-stainless-steel-hd8-8-3-4-wn1412kc50x10sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 38A2 **Product Default Location:** PSM **Product Drive Size:** (T25) **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC50X10SP **Product Size:** 5 **Product Special Notes:** (HD8.8,3.4) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 12 Pan Torx Steel Zinc Plated (WN1412KC50X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-12-pan-torx-steel-zinc-plated-wn1412kc50x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B5, 38A4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC50X12Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16/8 Pan Torx (T20) HD 9.0 (WN1412KC50X16/8)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-8-pan-torx-t20-hd-9-0-wn1412kc50x16-8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T20) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16/8 **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC50X16/8 **Product Size:** 5 **Product Special Notes:** HD 9.0 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Torx Deltacol S443 HDIA-12MM T15/PSM07482 (WN1412KC50X16SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-torx-deltacol-s443-hdia-12mm-t15-psm07482-wn1412kc50x16sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC50X16SP **Product Size:** 5 **Product Special Notes:** DELTACOL S443 HDIA-12MM T15/PSM07482 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Torx (T20) Stainless Steel (WN1412KC50X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-torx-t20-stainless-steel-wn1412kc50x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T20) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC50X16SS **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 35 Pan Torx Pin Steel Zinc Plated (WN1412KCR30X35Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-35-pan-torx-pin-steel-zinc-plated-wn1412kcr30x35z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KCR30X35Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Torx Pin Stainless Steel (WN1412KCR30X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-torx-pin-stainless-steel-wn1412kcr30x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B1 **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KCR30X8SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Torx Pin Steel Zinc Plated (WN1412KCR30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-torx-pin-steel-zinc-plated-wn1412kcr30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B1 **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KCR30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 9 Pan Torx Pin Steel Black Zinc Plated (WN1412KCR30X9ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-9-pan-torx-pin-steel-black-zinc-plated-wn1412kcr30x9zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 9 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KCR30X9ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 40 Pan Torx Plus Stainless Steel Tl-20MM (WN1412KD30X40SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-40-pan-torx-plus-stainless-steel-tl-20mm-wn1412kd30x40ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KD30X40SS **Product Size:** 3 **Product Special Notes:** TL-20MM **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Pan Torx Pin Steel Zinc Plated (WN1412KDR30X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-pan-torx-pin-steel-zinc-plated-wn1412kdr30x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KDR30X14Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 18 Pan Torx Pin Steel Zinc Plated (WN1412KDR30X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-18-pan-torx-pin-steel-zinc-plated-wn1412kdr30x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KDR30X18Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 20 Pan Torx Plus Steel Zinc Plated (WN1412KDR35X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-20-pan-torx-plus-steel-zinc-plated-wn1412kdr35x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Plus **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KDR35X20Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Hex Stainless Steel Black Plated (WN1412KH35X12SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-hex-stainless-steel-black-plated-wn1412kh35x12sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Hex **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KH35X12SB **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Hex Steel Black Zinc Plated 2.5A/F (WN1412KH35X12SK)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-hex-steel-black-zinc-plated-2-5a-f-wn1412kh35x12sk/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Hex **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KH35X12SK **Product Size:** 3.5 **Product Special Notes:** 2.5A/F **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Hex Stainless Steel (WN1412KH35X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-hex-stainless-steel-wn1412kh35x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 13G3 **Product Default Location:** PSM **Product Drive Type:** Hex **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KH35X12SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 20 Hex Steel Zinc Plated A/F 3.0 (WN1412KH35X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-20-pan-hex-steel-zinc-plated-a-f-3-0-wn1412kh35x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Hex **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KH35X20Z **Product Size:** 3.5 **Product Special Notes:** A/F 3.0 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Combo 316 Stainless Steel (WN1412KX4X16SS6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-combo-316-stainless-steel-wn1412kx4x16ss6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Combo **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KX4X16SS6 **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 10 Countersunk Phillips Stainless Steel (WN1413KA18X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-10-countersunk-phillips-stainless-steel-wn1413ka18x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8B2 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA18X10SS **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 8 Countersunk Phillips Steel Black Zinc Plated (WN1413KA18X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-8-countersunk-phillips-steel-black-zinc-plated-wn1413ka18x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA18X8ZB **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 5 Countersunk Phillips Stainless Steel Special HD 3.2-3.6 (WN1413KA22X5SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-5-countersunk-phillips-stainless-steel-special-hd-3-2-3-6-wn1413ka22x5ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A5 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA22X5SS **Product Size:** 2.2 **Product Special Notes:** SPECIAL HD 3.2-3.6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Countersunk Phillips Stainless Steel (WN1413KA30X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-countersunk-phillips-stainless-steel-wn1413ka30x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA30X10SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Countersunk Phillips Stainless Steel (WN1413KA35X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-countersunk-phillips-stainless-steel-wn1413ka35x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA35X16SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 14 Countersunk Phillips 316 Stainless Steel (HD 9.3) Epol (WN1413KA40X14S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-14-countersunk-phillips-316-stainless-steel-hd-9-3-epol-wn1413ka40x14s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA40X14S6 **Product Size:** 4 **Product Special Notes:** (HD 9.3) EPOL **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Countersunk Phillips Stainless Steel Black Ruspert - 500 Hours Salt Spray To Red Rust (WN1413KA40X20S-BR)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-countersunk-phillips-stainless-steel-black-ruspert-500-hours-salt-spray-to-red-rust-wn1413ka40x20s-br/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 10C5 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA40X20S-BR **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Countersunk Phillips 316 Stainless Steel (HD 9.3) Epol (WN1413KA40X20S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-countersunk-phillips-316-stainless-steel-hd-9-3-epol-wn1413ka40x20s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA40X20S6 **Product Size:** 4 **Product Special Notes:** (HD 9.3) EPOL **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Countersunk Phillips Stainless Steel Black Ruspert Chrome Free - 500 Hours Salt Spray To Red Rust (WN1413KA40X20SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-countersunk-phillips-stainless-steel-black-ruspert-chrome-free-500-hours-salt-spray-to-red-rust-wn1413ka40x20sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA40X20SB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Countersunk Phillips Stainless Steel (WN1413KA40X20SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-countersunk-phillips-stainless-steel-wn1413ka40x20ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A2 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA40X20SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 24 Countersunk Phillips 316 Stainless Steel (HD 9.3) Epol (WN1413KA40X24S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-24-countersunk-phillips-316-stainless-steel-hd-9-3-epol-wn1413ka40x24s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 24 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA40X24S6 **Product Size:** 4 **Product Special Notes:** (HD 9.3) EPOL **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 30 Countersunk Phillips Stainless Steel (WN1413KA40X30SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-30-countersunk-phillips-stainless-steel-wn1413ka40x30ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA40X30SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Countersunk Phillips Steel Yellow Zinc Plated Cr3 (8 MIC) (WN1413KA50X16ZC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-countersunk-phillips-steel-yellow-zinc-plated-cr3-8-mic-wn1413ka50x16zc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 38A2 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Yellow Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA50X16ZC **Product Size:** 5 **Product Special Notes:** CR3 (8 MIC) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 25 Countersunk Phillips 316 Stainless Steel (WN1413KA50X25S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-25-countersunk-phillips-316-stainless-steel-wn1413ka50x25s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA50X25S6 **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 18 Countersunk Phillips Steel Zinc Plated (WN1413KA60X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-18-countersunk-phillips-steel-zinc-plated-wn1413ka60x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KA60X18Z **Product Size:** 6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 4 Countersunk Pozi Steel Zinc Plated (WN1413KB18X4Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-4-countersunk-pozi-steel-zinc-plated-wn1413kb18x4z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB18X4Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Countersunk Pozi Steel Nickel Black Plated 5Micron (WN1413KB18X5-BN)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-countersunk-pozi-steel-nickel-black-plated-5micron-wn1413kb18x5-bn/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Nickel Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB18X5-BN **Product Size:** 1/8 **Product Special Notes:** 5MICRON **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 55 Countersunk Pozi Steel Nickel Plated (WN1413KB18X5-N5)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-55-countersunk-pozi-steel-nickel-plated-wn1413kb18x5-n5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 55 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB18X5-N5 **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Countersunk Pozi Steel Zinc Plated (WN1413KB18X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-countersunk-pozi-steel-zinc-plated-wn1413kb18x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB18X5Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Countersunk Pozi Steel Black Zinc Plated 5 Mic (WN1413KB18X5ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-countersunk-pozi-steel-black-zinc-plated-5-mic-wn1413kb18x5zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB18X5ZB **Product Size:** 1/8 **Product Special Notes:** 5 MIC **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 8 Countersunk Pozi Steel Zinc Plated (WN1413KB18X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-8-countersunk-pozi-steel-zinc-plated-wn1413kb18x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB18X8Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 10 Countersunk Pozi Steel Black Zinc Plated (WN1413KB22X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-10-countersunk-pozi-steel-black-zinc-plated-wn1413kb22x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB22X10ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 14 Countersunk Pozi Steel Zinc Plated (WN1413KB22X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-14-countersunk-pozi-steel-zinc-plated-wn1413kb22x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB22X14Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 14 Countersunk Pozi Steel Black Zinc Plated (WN1413KB22X14ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-14-countersunk-pozi-steel-black-zinc-plated-wn1413kb22x14zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB22X14ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 16 Countersunk Pozi Steel Zinc Plated (WN1413KB22X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-16-countersunk-pozi-steel-zinc-plated-wn1413kb22x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB22X16Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 5 Countersunk Pozi Steel Zinc Plated (WN1413KB22X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-5-countersunk-pozi-steel-zinc-plated-wn1413kb22x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB22X5Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Countersunk Pozi Steel Zinc Plated (WN1413KB22X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-countersunk-pozi-steel-zinc-plated-wn1413kb22x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB22X6Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Countersunk Pozi Steel Black Zinc Plated (WN1413KB22X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-countersunk-pozi-steel-black-zinc-plated-wn1413kb22x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB22X6ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Countersunk Pozi Steel Black Zinc Plated (WN1413KB22X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-countersunk-pozi-steel-black-zinc-plated-wn1413kb22x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB22X8ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Countersunk Pozi Steel Zinc Plated (WN1413KB25X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-countersunk-pozi-steel-zinc-plated-wn1413kb25x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X10Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Countersunk Pozi Steel Black Zinc Plated (WN1413KB25X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-countersunk-pozi-steel-black-zinc-plated-wn1413kb25x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X10ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 12 Countersunk Pozi Steel Black Zinc Plated (WN1413KB25X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-12-countersunk-pozi-steel-black-zinc-plated-wn1413kb25x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X12ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 20 Countersunk Pozi Steel Zinc Plated (WN1413KB25X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-20-countersunk-pozi-steel-zinc-plated-wn1413kb25x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X20Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 20 Countersunk Pozi Steel Black Zinc Plated (WN1413KB25X20ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-20-countersunk-pozi-steel-black-zinc-plated-wn1413kb25x20zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X20ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 25 Countersunk Pozi Steel Black Zinc Plated (WN1413KB25X25ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-25-countersunk-pozi-steel-black-zinc-plated-wn1413kb25x25zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X25ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 5 Countersunk Pozi Steel Zinc Plated (WN1413KB25X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-5-countersunk-pozi-steel-zinc-plated-wn1413kb25x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X5Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 7 Countersunk Pozi Steel Zinc Plated (WN1413KB25X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-7-countersunk-pozi-steel-zinc-plated-wn1413kb25x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X7Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Countersunk Pozi Steel Black Zinc Plated (WN1413KB25X8BTZ)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-countersunk-pozi-steel-black-zinc-plated-wn1413kb25x8btz/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB25X8BTZ **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Countersunk Pozi Steel Black Zinc Plated Fl/Brz (WN1413KB30X10FB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-countersunk-pozi-steel-black-zinc-plated-fl-brz-wn1413kb30x10fb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Countersunk **Product PSM Part Number:** WN1413KB30X10FB **Product Size:** 3 **Product Special Notes:** FL/BRZ **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Pozi Steel Black Zinc Plated (WN1412KB40X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-pozi-steel-black-zinc-plated-wn1412kb40x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X16ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 18 Pan Pozi Steel Black Zinc Plated (WN1412KB40X18ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-18-pan-pozi-steel-black-zinc-plated-wn1412kb40x18zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X18ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Pan Pozi Steel Black Zinc Plated (WN1412KB40X20ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-pan-pozi-steel-black-zinc-plated-wn1412kb40x20zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A5 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X20ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 25 Pan Pozi Stainless Steel Plas-Fix (WN1412KB40X25SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-25-pan-pozi-stainless-steel-plas-fix-wn1412kb40x25ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X25SS **Product Size:** 4 **Product Special Notes:** PLAS-FIX **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 25 Pan Pozi Steel Black Zinc Plated (WN1412KB40X25ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-25-pan-pozi-steel-black-zinc-plated-wn1412kb40x25zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A5 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X25ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 30 Pan Pozi Steel Black Zinc Plated (WN1412KB40X30ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-30-pan-pozi-steel-black-zinc-plated-wn1412kb40x30zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X30ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 40 Pan Pozi 316 Stainless Steel (THD 20MM) (WN1412KB40X40S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-40-pan-pozi-316-stainless-steel-thd-20mm-wn1412kb40x40s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X40S6 **Product Size:** 4 **Product Special Notes:** (THD 20MM) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 40 Pan Pozi Steel Zinc Plated (WN1412KB40X40Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-40-pan-pozi-steel-zinc-plated-wn1412kb40x40z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X40Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Pozi Stainless Steel Black Plated (WN1412KB40X8SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-pozi-stainless-steel-black-plated-wn1412kb40x8sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X8SB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Pozi Stainless Steel (WN1412KB40X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-pozi-stainless-steel-wn1412kb40x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X8SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Pozi Steel Zinc Plated (WN1412KB40X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-pozi-steel-zinc-plated-wn1412kb40x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X8Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Pozi Steel Black Zinc Plated (WN1412KB40X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-pozi-steel-black-zinc-plated-wn1412kb40x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X8ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 10 Pan Pozi Steel Zinc Plated (WN1412KB50X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-10-pan-pozi-steel-zinc-plated-wn1412kb50x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X10Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 12 Pan Pozi 316 Stainless Steel (WN1412KB50X12S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-12-pan-pozi-316-stainless-steel-wn1412kb50x12s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X12S6 **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 12 Pan Pozi Steel Zinc Plated (WN1412KB50X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-12-pan-pozi-steel-zinc-plated-wn1412kb50x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X12Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 12 Pan Pozi Steel Black Zinc Plated (WN1412KB50X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-12-pan-pozi-steel-black-zinc-plated-wn1412kb50x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X12ZB **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Pozi Steel Black Zinc Plated (WN1412KB50X16B)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-pozi-steel-black-zinc-plated-wn1412kb50x16b/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X16B **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Pozi Stainless Steel (WN1412KB50X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-pozi-stainless-steel-wn1412kb50x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X16SS **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Pozi Steel Zinc Plated (WN1412KB50X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-pozi-steel-zinc-plated-wn1412kb50x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X16Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Pozi Steel Black Zinc Plated (WN1412KB50X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-pozi-steel-black-zinc-plated-wn1412kb50x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X16ZB **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 18 Pan Pozi Steel Zinc Plated (HD 8.2MM) (WN1412KB50X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-18-pan-pozi-steel-zinc-plated-hd-8-2mm-wn1412kb50x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X18Z **Product Size:** 5 **Product Special Notes:** (HD 8.2MM) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 20 Pan Pozi Steel Black Zinc Plated (WN1412KB50X20ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-20-pan-pozi-steel-black-zinc-plated-wn1412kb50x20zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X20ZB **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 40 Pan Pozi Steel Yellow Zinc Plated (WN1412KB50X40ZC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-40-pan-pozi-steel-yellow-zinc-plated-wn1412kb50x40zc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X40ZC **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 20 Pan Pozi Steel Zinc Plated (WN1412KB60X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-20-pan-pozi-steel-zinc-plated-wn1412kb60x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B5 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB60X20Z **Product Size:** 6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.6 X 4.5 Pan Torx (T5) Stainless Steel (WN1412KC16X4.5S)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-6-x-4-5-pan-torx-t5-stainless-steel-wn1412kc16x4-5s/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T5) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4.5 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC16X4.5S **Product Size:** 1.6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.6 X 4 Pan Torx Steel Black Zinc Plated (WN1412KC16X4ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-6-x-4-pan-torx-steel-black-zinc-plated-wn1412kc16x4zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC16X4ZB **Product Size:** 1.6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 12 Pan Torx Steel Black Zinc Plated (HD3.6) (WN1412KC18X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-12-pan-torx-steel-black-zinc-plated-hd3-6-wn1412kc18x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC18X12ZB **Product Size:** 1/8 **Product Special Notes:** (HD3.6) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 4 Pan Torx Steel Zinc Plated (WN1412KC18X4Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-4-pan-torx-steel-zinc-plated-wn1412kc18x4z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC18X4Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 4 Pan Torx (T6) Steel Black Zinc Plated (WN1412KC18X4ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-4-pan-torx-t6-steel-black-zinc-plated-wn1412kc18x4zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC18X4ZB **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Pan Torx (T6) Stainless Steel (WN1412KC18X5SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-pan-torx-t6-stainless-steel-wn1412kc18x5ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC18X5SS **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 6 Pan Torx Steel Zinc Plated (WN1412KC18X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-6-pan-torx-steel-zinc-plated-wn1412kc18x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5A4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC18X6Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 7 Pan Torx (T6) Stainless Steel (WN1412KC18X7SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-7-pan-torx-t6-stainless-steel-wn1412kc18x7ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC18X7SS **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 8 Pan Torx Steel Zinc Plated (WN1412KC18X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-8-pan-torx-steel-zinc-plated-wn1412kc18x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5A4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC18X8Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 10 Pan Torx Stainless Steel (WN1412KC22X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-10-pan-torx-stainless-steel-wn1412kc22x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X10SS **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 10 Pan Torx (T6) Steel Zinc Plated (WN1412KC22X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-10-pan-torx-t6-steel-zinc-plated-wn1412kc22x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B3 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X10Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 12 Pan Torx 316 Stainless Steel (WN1412KC22X12S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-12-pan-torx-316-stainless-steel-wn1412kc22x12s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X12S6 **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 12 Pan Torx (T6) Steel Zinc Plated (WN1412KC22X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-12-pan-torx-t6-steel-zinc-plated-wn1412kc22x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X12Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 12 Pan Torx (T6) Steel Black Zinc Plated (WN1412KC22X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-12-pan-torx-t6-steel-black-zinc-plated-wn1412kc22x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X12ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 16 Pan Torx Steel Black Zinc Plated (WN1412KC22X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-16-pan-torx-steel-black-zinc-plated-wn1412kc22x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X16ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 5 Pan Torx (T6) Steel Black Zinc Plated (WN1412KC22X5ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-5-pan-torx-t6-steel-black-zinc-plated-wn1412kc22x5zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X5ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Pan Torx 316 Stainless Steel (WN1412KC22X6S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-pan-torx-316-stainless-steel-wn1412kc22x6s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 13G5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X6S6 **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Pan Torx (T6) Steel Zinc Plated (WN1412KC22X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-pan-torx-t6-steel-zinc-plated-wn1412kc22x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X6Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Pan Torx Steel Black Zinc Plated (WN1412KC22X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-pan-torx-steel-black-zinc-plated-wn1412kc22x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X6ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 7 Pan Torx Stainless Steel (WN1412KC22X7SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-7-pan-torx-stainless-steel-wn1412kc22x7ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X7SS **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 7 Pan Torx Steel Zinc Plated 10 Microns (WN1412KC22X7Z10)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-7-pan-torx-steel-zinc-plated-10-microns-wn1412kc22x7z10/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X7Z10 **Product Size:** 2.2 **Product Special Notes:** 10 MICRONS **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 7 Pan Torx Steel Black Zinc Plated (WN1412KC22X7ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-7-pan-torx-steel-black-zinc-plated-wn1412kc22x7zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X7ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Torx (T6) Steel Zinc Plated (WN1412KC22X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-torx-t6-steel-zinc-plated-wn1412kc22x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X8Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Torx Steel Black Zinc Plated (WN1412KC22X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-torx-steel-black-zinc-plated-wn1412kc22x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC22X8ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Torx Steel Zinc Plated (WN1412KC25X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-torx-steel-zinc-plated-wn1412kc25x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC25X10Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Torx Steel Black Zinc Plated (WN1412KC25X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-torx-steel-black-zinc-plated-wn1412kc25x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC25X10ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 12 Pan Torx (T7) 316 Stainless Steel (WN1412KC25X12S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-12-pan-torx-t7-316-stainless-steel-wn1412kc25x12s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T7) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC25X12S6 **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 12 Pan Torx Steel Zinc Plated (WN1412KC25X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-12-pan-torx-steel-zinc-plated-wn1412kc25x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC25X12Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Torx Stainless Steel (WN1412KC25X6SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-torx-stainless-steel-wn1412kc25x6ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Torx 316 Stainless Steel (WN1412KC3010S6B)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-torx-316-stainless-steel-wn1412kc3010s6b/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC3010S6B **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Torx 316 Stainless Steel (WN1412KC30X10S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-torx-316-stainless-steel-wn1412kc30x10s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 38A5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X10S6 **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Torx (T10) Steel Zinc Plated (WN1412KC30X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-torx-t10-steel-zinc-plated-wn1412kc30x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X10Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Torx Steel Zinc Plated 100% Inspect**Po Use Only (WN1412KC30X12-P)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-torx-steel-zinc-plated-100-inspect-po-use-only-wn1412kc30x12-p/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X12-P **Product Size:** 3 **Product Special Notes:** 100% inspect**po use only **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Torx (T10) Stainless Steel (WN1412KC30X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-torx-t10-stainless-steel-wn1412kc30x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X12SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Torx Steel Zinc Plated (WN1412KC30X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-torx-steel-zinc-plated-wn1412kc30x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** RES **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X12Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Pan Torx Stainless Steel (WN1412KC30X14SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-pan-torx-stainless-steel-wn1412kc30x14ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X14SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 20 Pan Torx Stainless Steel (WN1412KC30X20SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-20-pan-torx-stainless-steel-wn1412kc30x20ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X20SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Pan Torx Steel Zinc Plated PO Only (WN1412KC30X25-P)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-pan-torx-steel-zinc-plated-po-only-wn1412kc30x25-p/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X25-P **Product Size:** 3 **Product Special Notes:** PO Only **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Pan Torx Steel Zinc Plated (WN1412KC30X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-pan-torx-steel-zinc-plated-wn1412kc30x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X25Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 30 Pan Torx Stainless Steel (WN1412KC30X30SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-30-pan-torx-stainless-steel-wn1412kc30x30ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X30SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 30 Pan Torx Steel Black Zinc Plated (WN1412KC30X30ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-30-pan-torx-steel-black-zinc-plated-wn1412kc30x30zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X30ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 35 Pan Torx Steel Black Zinc Plated (TIO) Tl30.0 (WN1412KC30X35ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-35-pan-torx-steel-black-zinc-plated-tio-tl30-0-wn1412kc30x35zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X35ZB **Product Size:** 3 **Product Special Notes:** (TIO) TL30.0 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Torx Steel Black Zinc Plated (WN1412KC30X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-torx-steel-black-zinc-plated-wn1412kc30x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X6ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Torx Steel Zinc Plated (WN1412KC30X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-torx-steel-zinc-plated-wn1412kc30x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X6Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 7 Pan Torx (T10) Steel Zinc Plated (WN1412KC30X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-7-pan-torx-t10-steel-zinc-plated-wn1412kc30x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X7Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Torx (T10) Stainless Steel (WN1412KC30X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-torx-t10-stainless-steel-wn1412kc30x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X8SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Torx (T10) Steel Zinc Plated (WN1412KC30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-torx-t10-steel-zinc-plated-wn1412kc30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 40 Pan Pozi Steel Zinc Plated (WN1412KB50X40Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-40-pan-pozi-steel-zinc-plated-wn1412kb50x40z/) **Published:** May 13, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB50X40Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 20 Pan Torx Steel Zinc Plated (WN1412KC25X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-20-pan-torx-steel-zinc-plated-wn1412kc25x20z/) **Published:** May 31, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 5B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KC25X20Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 4 Pan Pozi Steel Nickel Plated (WN1412KB25X4-NI)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-4-pan-pozi-steel-nickel-plated-wn1412kb25x4-ni/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 4 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X4-NI **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 5 Pan Pozi Stainless Steel (WN1412KB25X5SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-5-pan-pozi-stainless-steel-wn1412kb25x5ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X5SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 5 Pan Pozi Steel Zinc Plated (WN1412KB25X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-5-pan-pozi-steel-zinc-plated-wn1412kb25x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X5Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Pozi 316 Stainless Steel (WN1412KB25X6S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-pozi-316-stainless-steel-wn1412kb25x6s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X6S6 **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Pozi Stainless Steel Black Plated (WN1412KB25X6SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-pozi-stainless-steel-black-plated-wn1412kb25x6sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X6SB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Pozi Stainless Steel (WN1412KB25X6SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-pozi-stainless-steel-wn1412kb25x6ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X6SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Pozi Steel Zinc Plated (WN1412KB25X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-pozi-steel-zinc-plated-wn1412kb25x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X6Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Pozi Steel Black Zinc Plated (WN1412KB25X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-pozi-steel-black-zinc-plated-wn1412kb25x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X6ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Pozi Stainless Steel (WN1412KB25X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-pozi-stainless-steel-wn1412kb25x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X8SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Pozi Steel Black Zinc Plated (WN1412KB25X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-pozi-steel-black-zinc-plated-wn1412kb25x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X8ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Pozi 316 Stainless Steel (WN1412KB3012S6B)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-pozi-316-stainless-steel-wn1412kb3012s6b/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB3012S6B **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 7 Pan Pozi Steel Yellow Zinc Plated (WN1412KB307TRZY)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-7-pan-pozi-steel-yellow-zinc-plated-wn1412kb307trzy/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB307TRZY **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Pozi Steel Zinc Plated Po Only (WN1412KB30X10-P)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-pozi-steel-zinc-plated-po-only-wn1412kb30x10-p/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X10-P **Product Size:** 3 **Product Special Notes:** PO Only **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Pozi Stainless Steel Black Plated (WN1412KB30X10SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-pozi-stainless-steel-black-plated-wn1412kb30x10sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X10SB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Pozi Stainless Steel (WN1412KB30X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-pozi-stainless-steel-wn1412kb30x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X10SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Pozi Steel Zinc Plated (WN1412KB30X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-pozi-steel-zinc-plated-wn1412kb30x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B3, 38A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X10Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Pozi Steel Black Zinc Plated (WN1412KB30X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-pozi-steel-black-zinc-plated-wn1412kb30x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X10ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Pozi Stainless Steel (WN1412KB30X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-pozi-stainless-steel-wn1412kb30x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X12SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Pozi Steel Zinc Plated (WN1412KB30X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-pozi-steel-zinc-plated-wn1412kb30x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X12Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Pozi Steel Black Zinc Plated (WN1412KB30X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-pozi-steel-black-zinc-plated-wn1412kb30x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X12ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Pan Pozi Stainless Steel Black Plated (WN1412KB30X14SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-pan-pozi-stainless-steel-black-plated-wn1412kb30x14sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X14SB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Pan Pozi Stainless Steel (WN1412KB30X14SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-pan-pozi-stainless-steel-wn1412kb30x14ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X14SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Pan Pozi Steel Zinc Plated (WN1412KB30X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-pan-pozi-steel-zinc-plated-wn1412kb30x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X14Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 14 Pan Pozi Steel Black Zinc Plated (WN1412KB30X14ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-14-pan-pozi-steel-black-zinc-plated-wn1412kb30x14zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X14ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Pan Pozi Stainless Steel (WN1412KB30X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-pan-pozi-stainless-steel-wn1412kb30x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X16SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Pan Pozi Steel Zinc Plated (WN1412KB30X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-pan-pozi-steel-zinc-plated-wn1412kb30x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X16Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Pan Pozi Steel Black Zinc Plated (WN1412KB30X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-pan-pozi-steel-black-zinc-plated-wn1412kb30x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X16ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 18 Pan Pozi Stainless Steel (WN1412KB30X18SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-18-pan-pozi-stainless-steel-wn1412kb30x18ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 18 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X18SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 18 Pan Pozi Steel Zinc Plated (WN1412KB30X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-18-pan-pozi-steel-zinc-plated-wn1412kb30x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X18Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 18 Pan Pozi Steel Black Zinc Plated (WN1412KB30X18ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-18-pan-pozi-steel-black-zinc-plated-wn1412kb30x18zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X18ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 20 Pan Pozi Steel Zinc Plated (WN1412KB30X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-20-pan-pozi-steel-zinc-plated-wn1412kb30x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X20Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 20 Pan Pozi Steel Black Zinc Plated (WN1412KB30X20ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-20-pan-pozi-steel-black-zinc-plated-wn1412kb30x20zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X20ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Pan Pozi Steel Zinc Plated (WN1412KB30X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-pan-pozi-steel-zinc-plated-wn1412kb30x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X25Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 30 Pan Pozi Steel Zinc Plated (WN1412KB30X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-30-pan-pozi-steel-zinc-plated-wn1412kb30x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X30Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 40 Pan Pozi Stainless Steel Half Thread=20MM (WN1412KB30X40SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-40-pan-pozi-stainless-steel-half-thread-20mm-wn1412kb30x40ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X40SS **Product Size:** 3 **Product Special Notes:** HALF THREAD=20MM **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 40 Pan Pozi Steel Zinc Plated (WN1412KB30X40Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-40-pan-pozi-steel-zinc-plated-wn1412kb30x40z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X40Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 5 Pan Pozi Steel Zinc Plated (WN1412KB30X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-5-pan-pozi-steel-zinc-plated-wn1412kb30x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X5Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Pozi Stainless Steel Black Plated (WN1412KB30X6SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-pozi-stainless-steel-black-plated-wn1412kb30x6sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X6SB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Pozi Stainless Steel (WN1412KB30X6SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-pozi-stainless-steel-wn1412kb30x6ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X6SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Pozi Steel Zinc Plated (WN1412KB30X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-pozi-steel-zinc-plated-wn1412kb30x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B3, 38A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X6Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Pozi Steel Black Zinc Plated (WN1412KB30X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-pozi-steel-black-zinc-plated-wn1412kb30x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X6ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 7 Pan Pozi Steel Zinc Plated (WN1412KB30X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-7-pan-pozi-steel-zinc-plated-wn1412kb30x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X7Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Pozi Steel Yellow Zinc Plated (WN1412KB30X8-ZC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-pozi-steel-yellow-zinc-plated-wn1412kb30x8-zc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Yellow Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X8-ZC **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Pozi 316 Stainless Steel (WN1412KB30X8S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-pozi-316-stainless-steel-wn1412kb30x8s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X8S6 **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Pozi Stainless Steel Black Plated (WN1412KB30X8SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-pozi-stainless-steel-black-plated-wn1412kb30x8sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X8SB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Pozi Stainless Steel (WN1412KB30X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-pozi-stainless-steel-wn1412kb30x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X8SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Pozi Steel Zinc Plated (WN1412KB30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-pozi-steel-zinc-plated-wn1412kb30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B3, 38A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Pozi Steel Black Zinc Plated (WN1412KB30X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-pozi-steel-black-zinc-plated-wn1412kb30x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X8ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Pozi Steel Nickel Black Plated 120 Hour (WN1412KB30X8ZNB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-pozi-steel-nickel-black-plated-120-hour-wn1412kb30x8znb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B3, 13G8 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Nickel Black Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB30X8ZNB **Product Size:** 3 **Product Special Notes:** 120 HOUR **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Pozi Stainless Steel (WN1412KB35X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-pozi-stainless-steel-wn1412kb35x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A5 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X10SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Pozi Steel Black Zinc Plated (WN1412KB35X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-pozi-steel-black-zinc-plated-wn1412kb35x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X10ZB **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Pozi Steel Yellow Zinc Plated (WN1412KB35X10ZC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-pozi-steel-yellow-zinc-plated-wn1412kb35x10zc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B5 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Yellow Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X10ZC **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 10 Pan Pozi Steel Yellow Zinc Plated Use ZC Code (WN1412KB35X10ZD)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-10-pan-pozi-steel-yellow-zinc-plated-use-zc-code-wn1412kb35x10zd/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X10ZD **Product Size:** 3.5 **Product Special Notes:** use ZC code **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Pan Pozi Stainless Steel (WN1412KB35X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-pozi-stainless-steel-wn1412kb35x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X12SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Pan Pozi Stainless Steel (WN1412KB35X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-pan-pozi-stainless-steel-wn1412kb35x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X16SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Pan Pozi Steel Black Zinc Plated (WN1412KB35X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-pan-pozi-steel-black-zinc-plated-wn1412kb35x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X16ZB **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 18 Pan Pozi Stainless Steel (WN1412KB35X18SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-18-pan-pozi-stainless-steel-wn1412kb35x18ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X18SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 25 Pan Pozi Steel Black Zinc Plated (WN1412KB35X25BZ)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-25-pan-pozi-steel-black-zinc-plated-wn1412kb35x25bz/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B5 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X25BZ **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 25 Pan Pozi Steel Zinc Plated (WN1412KB35X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-25-pan-pozi-steel-zinc-plated-wn1412kb35x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X25Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 35 Pan Pozi Steel Zinc Plated (WN1412KB35X35Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-35-pan-pozi-steel-zinc-plated-wn1412kb35x35z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X35Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 8 Pan Pozi Stainless Steel (WN1412KB35X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-8-pan-pozi-stainless-steel-wn1412kb35x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X8SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 8 Pan Pozi Steel Zinc Plated (WN1412KB35X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-8-pan-pozi-steel-zinc-plated-wn1412kb35x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X8Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 8 Pan Pozi Steel Zinc Plated (HD 6.9MM) (WN1412KB35X8ZP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-8-pan-pozi-steel-zinc-plated-hd-6-9mm-wn1412kb35x8zp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB35X8ZP **Product Size:** 3.5 **Product Special Notes:** (HD 6.9MM) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Pozi 316 Stainless Steel EP (WN1412KB40X10S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-pozi-316-stainless-steel-ep-wn1412kb40x10s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X10S6 **Product Size:** 4 **Product Special Notes:** EP **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Pozi Stainless Steel (WN1412KB40X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-pozi-stainless-steel-wn1412kb40x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X10SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Pozi Steel Zinc Plated (WN1412KB40X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-pozi-steel-zinc-plated-wn1412kb40x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X10Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Pozi Steel Black Zinc Plated (WN1412KB40X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-pozi-steel-black-zinc-plated-wn1412kb40x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X10ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Pozi Stainless Steel (WN1412KB40X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-pozi-stainless-steel-wn1412kb40x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X12SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Pozi Steel Black Zinc Plated (WN1412KB40X12ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-pozi-steel-black-zinc-plated-wn1412kb40x12zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A5 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X12ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 14 Pan Pozi Steel Zinc Plated Po Only (WN1412KB40X14-P)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-14-pan-pozi-steel-zinc-plated-po-only-wn1412kb40x14-p/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X14-P **Product Size:** 4 **Product Special Notes:** PO Only **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 14 Pan Pozi Steel Black Zinc Plated (WN1412KB40X14ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-14-pan-pozi-steel-black-zinc-plated-wn1412kb40x14zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B5 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X14ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Pozi 316 Stainless Steel (WN1412KB40X16S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-pozi-316-stainless-steel-wn1412kb40x16s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X16S6 **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Pozi Stainless Steel (WN1412KB40X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-pozi-stainless-steel-wn1412kb40x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X16SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Pozi Steel Zinc Plated (WN1412KB40X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-pozi-steel-zinc-plated-wn1412kb40x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A4 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB40X16Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws for Plastics 2.5 X 8 Pan Pozi Steel Zinc Plated (WN1412KB25X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-pozi-steel-zinc-plated-wn1412kb25x8z/) **Published:** April 22, 2026 **Author:** morantaalona **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product PSM Part Number:** WN1412KB25X8ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 10 Pan Flange Torx Steel Zinc Plated (WN1411KC50X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-10-pan-flange-torx-steel-zinc-plated-wn1411kc50x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 3B5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC50X10Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 12 Pan Flange Torx Stainless Steel (WN1411KC50X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-12-pan-flange-torx-stainless-steel-wn1411kc50x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC50X12SS **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Flange Torx (T20) Steel Zinc Plated (WN1411KC50X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-flange-torx-t20-steel-zinc-plated-wn1411kc50x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T20) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC50X16Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Flange Torx (T15) Steel Zinc Plated (12MM) (WN1411KC50X16ZS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-flange-torx-t15-steel-zinc-plated-12mm-wn1411kc50x16zs/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B6 **Product Default Location:** PSM **Product Drive Size:** (T15) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC50X16ZS **Product Size:** 5 **Product Special Notes:** (12MM) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Flange Torx Pin Steel Zinc Plated (WN1411KCR30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-flange-torx-pin-steel-zinc-plated-wn1411kcr30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B1 **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KCR30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Torx Pin Steel Zinc Plated (WN1412K40X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-torx-pin-steel-zinc-plated-wn1412k40x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx Pin **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412K40X16Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.6 X 4 Pan Phillips Steel Zinc Plated (WN1412KA16X4Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-6-x-4-pan-phillips-steel-zinc-plated-wn1412ka16x4z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA16X4Z **Product Size:** 1.6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 4 Pan Phillips Steel Nickel Plated (WN1412KA18X4NI)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-4-pan-phillips-steel-nickel-plated-wn1412ka18x4ni/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 4 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA18X4NI **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 4 Pan Phillips Stainless Steel (WN1412KA18X4SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-4-pan-phillips-stainless-steel-wn1412ka18x4ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA18X4SS **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 6 Pan Phillips Steel Zinc Plated (WN1412KA18X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-6-pan-phillips-steel-zinc-plated-wn1412ka18x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 13G3 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA18X6Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Phillips Stainless Steel (WN1412KA22X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-phillips-stainless-steel-wn1412ka22x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A2 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA22X8SS **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Phillips Steel Zinc Plated (WN1412KA22X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-phillips-steel-zinc-plated-wn1412ka22x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA22X8Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Phillips Stainless Steel (WN1412KA25X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-phillips-stainless-steel-wn1412ka25x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA25X10SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Phillips Steel Zinc Plated (WN1412KA25X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-phillips-steel-zinc-plated-wn1412ka25x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA25X10Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Phillips Stainless Steel (WN1412KA25X6SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-phillips-stainless-steel-wn1412ka25x6ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA25X6SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Phillips 316 Stainless Steel (WN1412KA30X10S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-phillips-316-stainless-steel-wn1412ka30x10s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A2 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA30X10S6 **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Phillips Steel Zinc Plated (WN1412KA30X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-phillips-steel-zinc-plated-wn1412ka30x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA30X10Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Phillips 316 Stainless Steel (E-POLISH) (WN1412KA30X12S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-phillips-316-stainless-steel-e-polish-wn1412ka30x12s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA30X12S6 **Product Size:** 3 **Product Special Notes:** (E-POLISH) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 20 Pan Phillips Stainless Steel (WN1412KA30X20SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-20-pan-phillips-stainless-steel-wn1412ka30x20ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA30X20SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Phillips Steel Zinc Plated (WN1412KA30X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-phillips-steel-zinc-plated-wn1412ka30x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA30X6Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Phillips 316 Stainless Steel (WN1412KA30X8S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-phillips-316-stainless-steel-wn1412ka30x8s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA30X8S6 **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Phillips Stainless Steel (WN1412KA30X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-phillips-stainless-steel-wn1412ka30x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A2 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA30X8SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Phillips Steel Zinc Plated (WN1412KA30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-phillips-steel-zinc-plated-wn1412ka30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 13G3 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 8 Pan Phillips Steel Zinc Plated (WN1412KA35X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-8-pan-phillips-steel-zinc-plated-wn1412ka35x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA35X8Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Phillips Steel Black Zinc Plated (WN1412KA40X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-phillips-steel-black-zinc-plated-wn1412ka40x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X10ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Phillips Stainless Steel (WN1412KA40X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-phillips-stainless-steel-wn1412ka40x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X12SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 18 Pan Phillips Stainless Steel (WN1412KA40X18SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-18-pan-phillips-stainless-steel-wn1412ka40x18ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X18SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 18 Pan Phillips Steel Zinc Plated (WN1412KA40X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-18-pan-phillips-steel-zinc-plated-wn1412ka40x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X18Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Pan Phillips Steel Zinc Plated (HD 7.50MM) (WN1412KA40X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-pan-phillips-steel-zinc-plated-hd-7-50mm-wn1412ka40x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A5 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X20Z **Product Size:** 4 **Product Special Notes:** (HD 7.50MM) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 20 Pan Phillips Steel Black Zinc Plated (WN1412KA40X20ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-20-pan-phillips-steel-black-zinc-plated-wn1412ka40x20zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X20ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 22 Pan Phillips Stainless Steel (WN1412KA40X22SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-22-pan-phillips-stainless-steel-wn1412ka40x22ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X22SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Phillips Stainless Steel (WN1412KA40X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-phillips-stainless-steel-wn1412ka40x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X8SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Phillips Steel Zinc Plated (WN1412KA40X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-phillips-steel-zinc-plated-wn1412ka40x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA40X8Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 12 Pan Phillips Stainless Steel (WN1412KA50X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-12-pan-phillips-stainless-steel-wn1412ka50x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 48C3 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA50X12SS **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 14 Pan Phillips Steel Zinc Plated Pilot Point (WN1412KA50X14PP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-14-pan-phillips-steel-zinc-plated-pilot-point-wn1412ka50x14pp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA50X14PP **Product Size:** 5 **Product Special Notes:** PILOT POINT **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 20 Pan Phillips Steel Zinc Plated HD9.5/#2 Recess (WN1412KA60X20SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-20-pan-phillips-steel-zinc-plated-hd9-5-2-recess-wn1412ka60x20sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA60X20SP **Product Size:** 6 **Product Special Notes:** HD9.5/#2 RECESS **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 20 Pan Phillips Steel Black Zinc Plated (WN1412KA60X20ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-20-pan-phillips-steel-black-zinc-plated-wn1412ka60x20zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA60X20ZB **Product Size:** 6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 7.0 X 35 Pan Phillips Stainless Steel (WN1412KA70X35SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-7-0-x-35-pan-phillips-stainless-steel-wn1412ka70x35ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KA70X35SS **Product Size:** 7 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Phillips/Slot Stainless Steel (WN1412KAL25X6SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-phillips-slot-stainless-steel-wn1412kal25x6ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A2 **Product Default Location:** PSM **Product Drive Type:** Phillips/Slot **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KAL25X6SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Phillips/Slot Steel Zinc Plated (WN1412KAL25X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-phillips-slot-steel-zinc-plated-wn1412kal25x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips/Slot **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KAL25X6Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 10 Pan Pozi Steel Zinc Plated (WN1412KB18X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-10-pan-pozi-steel-zinc-plated-wn1412kb18x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB18X10Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 12 Pan Pozi Steel Zinc Plated 3.6MM HD DIA (WN1412KB18X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-12-pan-pozi-steel-zinc-plated-3-6mm-hd-dia-wn1412kb18x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB18X12Z **Product Size:** 1/8 **Product Special Notes:** 3.6MM HD DIA **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 16 Pan Pozi Steel Zinc Plated (WN1412KB18X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-16-pan-pozi-steel-zinc-plated-wn1412kb18x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB18X16Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 55 Pan Pozi Steel Nickel Plated (HD=3.6) 5Mic (WN1412KB18X5-N5)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-55-pan-pozi-steel-nickel-plated-hd-3-6-5mic-wn1412kb18x5-n5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 55 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB18X5-N5 **Product Size:** 1/8 **Product Special Notes:** (HD=3.6) 5MIC **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 5 Pan Pozi Steel Black Zinc Plated (WN1412KB18X5BZ)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-5-pan-pozi-steel-black-zinc-plated-wn1412kb18x5bz/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB18X5BZ **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 6 Pan Pozi Steel Zinc Plated 3.6MM HD DIA (WN1412KB18X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-6-pan-pozi-steel-zinc-plated-3-6mm-hd-dia-wn1412kb18x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB18X6Z **Product Size:** 1/8 **Product Special Notes:** 3.6MM HD DIA **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 85 Pan Pozi Steel Nickel Plated 5 Mic (WN1412KB18X8-N5)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-85-pan-pozi-steel-nickel-plated-5-mic-wn1412kb18x8-n5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 85 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB18X8-N5 **Product Size:** 1/8 **Product Special Notes:** 5 MIC **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 8 Pan Pozi Steel Zinc Plated (WN1412KB18X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-8-pan-pozi-steel-zinc-plated-wn1412kb18x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB18X8Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 10 Pan Pozi Steel Zinc Plated (WN1412KB22X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-10-pan-pozi-steel-zinc-plated-wn1412kb22x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X10Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 12 Pan Pozi Steel Zinc Plated (WN1412KB22X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-12-pan-pozi-steel-zinc-plated-wn1412kb22x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X12Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 14 Pan Pozi Steel Zinc Plated (WN1412KB22X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-14-pan-pozi-steel-zinc-plated-wn1412kb22x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X14Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 16 Pan Pozi Steel Zinc Plated (WN1412KB22X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-16-pan-pozi-steel-zinc-plated-wn1412kb22x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X16Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 5 Pan Pozi Steel Black Zinc Plated (WN1412KB22X5ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-5-pan-pozi-steel-black-zinc-plated-wn1412kb22x5zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X5ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Pan Pozi Steel Black Zinc Plated (WN1412KB22X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-pan-pozi-steel-black-zinc-plated-wn1412kb22x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X6ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 7 Pan Pozi Steel Zinc Plated (WN1412KB22X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-7-pan-pozi-steel-zinc-plated-wn1412kb22x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X7Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Pozi Steel Black Zinc Plated (WN1412KB22X8-BZ)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-pozi-steel-black-zinc-plated-wn1412kb22x8-bz/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X8-BZ **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Pozi Stainless Steel (WN1412KB22X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-pozi-stainless-steel-wn1412kb22x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X8SS **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Pozi Steel Zinc Plated (WN1412KB22X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-pozi-steel-zinc-plated-wn1412kb22x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X8Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Pozi Steel Black Zinc Plated (WN1412KB22X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-pozi-steel-black-zinc-plated-wn1412kb22x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB22X8ZB **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 16 Pan Pozi Stainless Steel (WN1412KB2516SS#)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-16-pan-pozi-stainless-steel-wn1412kb2516ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB2516SS# **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Pozi Steel Black Zinc Plated (WN1412KB25X10BZ)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-pozi-steel-black-zinc-plated-wn1412kb25x10bz/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X10BZ **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Pozi Stainless Steel (WN1412KB25X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-pozi-stainless-steel-wn1412kb25x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X10SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Pozi Steel Zinc Plated (WN1412KB25X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-pozi-steel-zinc-plated-wn1412kb25x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X10Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 12 Pan Pozi Steel Zinc Plated (WN1412KB25X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-12-pan-pozi-steel-zinc-plated-wn1412kb25x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X12Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 14 Pan Pozi Steel Zinc Plated (WN1412KB25X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-14-pan-pozi-steel-zinc-plated-wn1412kb25x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A2, 6B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X14Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 14 Pan Pozi Steel Black Zinc Plated (WN1412KB25X14ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-14-pan-pozi-steel-black-zinc-plated-wn1412kb25x14zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X14ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 16 Pan Pozi Stainless Steel (WN1412KB25X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-16-pan-pozi-stainless-steel-wn1412kb25x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X16SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 16 Pan Pozi Steel Zinc Plated (WN1412KB25X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-16-pan-pozi-steel-zinc-plated-wn1412kb25x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X16Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 16 Pan Pozi Steel Black Zinc Plated (WN1412KB25X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-16-pan-pozi-steel-black-zinc-plated-wn1412kb25x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X16ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 18 Pan Pozi Steel Zinc Plated (WN1412KB25X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-18-pan-pozi-steel-zinc-plated-wn1412kb25x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan **Product PSM Part Number:** WN1412KB25X18Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 7 Pan Flange Pozi Steel Zinc Plated (WN1411KB25X7Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-7-pan-flange-pozi-steel-zinc-plated-wn1411kb25x7z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X7Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Flange Pozi Steel Zinc Plated (WN1411KB25X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-flange-pozi-steel-zinc-plated-wn1411kb25x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X8Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Flange Pozi Steel Zinc Plated (HH 1.4MM) (WN1411KB25X8ZP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-flange-pozi-steel-zinc-plated-hh-1-4mm-wn1411kb25x8zp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X8ZP **Product Size:** 2.5 **Product Special Notes:** (HH 1.4MM) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Flange Pozi Stainless Steel (WN1411KB30X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-flange-pozi-stainless-steel-wn1411kb30x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X10SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Flange Pozi Steel Zinc Plated Nyplas Uh (WN1411KB30X12NY)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-flange-pozi-steel-zinc-plated-nyplas-uh-wn1411kb30x12ny/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X12NY **Product Size:** 3 **Product Special Notes:** NYPLAS UH **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Flange Pozi Steel Zinc Plated - (HD 8MM) (WN1411KB30X12SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-flange-pozi-steel-zinc-plated-hd-8mm-wn1411kb30x12sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X12SP **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Pan Flange Pozi Stainless Steel (WN1411KB30X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-pan-flange-pozi-stainless-steel-wn1411kb30x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X16SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 18 Pan Flange Pozi Steel Zinc Plated (WN1411KB30X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-18-pan-flange-pozi-steel-zinc-plated-wn1411kb30x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X18Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 30 Pan Flange Pozi Steel Zinc Plated (WN1411KB30X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-30-pan-flange-pozi-steel-zinc-plated-wn1411kb30x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X30Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 35 Pan Flange Pozi Steel Zinc Plated # 2 / Tl 20 (WN1411KB30X35SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-35-pan-flange-pozi-steel-zinc-plated-2-tl-20-wn1411kb30x35sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 35 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X35SP **Product Size:** 3 **Product Special Notes:** # 2 / TL 20 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 40 Pan Flange Pozi Steel Zinc Plated #2/Tl=20 (WN1411KB30X40SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-40-pan-flange-pozi-steel-zinc-plated-2-tl-20-wn1411kb30x40sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 40 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X40SP **Product Size:** 3 **Product Special Notes:** #2/TL=20 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Flange Pozi Steel Black Zinc Plated (WN1411KB30X6BZ)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-flange-pozi-steel-black-zinc-plated-wn1411kb30x6bz/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X6BZ **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 7 Pan Flange Pozi Steel Zinc Plated (HD7.2/HH2.1) (WN1411KB30X7SPE)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-7-pan-flange-pozi-steel-zinc-plated-hd7-2-hh2-1-wn1411kb30x7spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X7SPE **Product Size:** 3 **Product Special Notes:** (HD7.2/HH2.1) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Flange Pozi Stainless Steel (WN1411KB30X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-flange-pozi-stainless-steel-wn1411kb30x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X8SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Flange Pozi Steel Zinc Plated (WN1411KB30X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-flange-pozi-steel-zinc-plated-wn1411kb30x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB30X8Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 12 Pan Flange Pozi Steel Zinc Plated (WN1411KB35X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-12-pan-flange-pozi-steel-zinc-plated-wn1411kb35x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB35X12Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Pan Flange Pozi Stainless Steel (WN1411KB35X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-pan-flange-pozi-stainless-steel-wn1411kb35x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB35X16SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Pan Flange Pozi Steel Zinc Plated (WN1411KB35X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-pan-flange-pozi-steel-zinc-plated-wn1411kb35x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB35X16Z **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Pan Flange Pozi Steel Black Zinc Plated (HD 7.0MM) (WN1411KB35X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-pan-flange-pozi-steel-black-zinc-plated-hd-7-0mm-wn1411kb35x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB35X16ZB **Product Size:** 3.5 **Product Special Notes:** (HD 7.0MM) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 6 Pan Flange Pozi Steel Black Zinc Plated (WN1411KB35X6ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-6-pan-flange-pozi-steel-black-zinc-plated-wn1411kb35x6zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB35X6ZB **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 7 Pan Flange Pozi Stainless Steel (WN1411KB35X7SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-7-pan-flange-pozi-stainless-steel-wn1411kb35x7ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB35X7SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 8 Pan Flange Pozi Steel Zinc Plated (WN1411KB35X8ZP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-8-pan-flange-pozi-steel-zinc-plated-wn1411kb35x8zp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB35X8ZP **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Flange Pozi Stainless Steel (WN1411KB40X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-flange-pozi-stainless-steel-wn1411kb40x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB40X10SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Flange Pozi Stainless Steel (WN1411KB40X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-flange-pozi-stainless-steel-wn1411kb40x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB40X12SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 14 Pan Flange Pozi Steel Zinc Plated (WN1411KB40X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-14-pan-flange-pozi-steel-zinc-plated-wn1411kb40x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB40X14Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Flange Pozi Stainless Steel (WN1411KB40X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-flange-pozi-stainless-steel-wn1411kb40x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB40X16SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 18 Pan Flange Pozi Stainless Steel (WN1411KB40X18SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-18-pan-flange-pozi-stainless-steel-wn1411kb40x18ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A1, 8B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 18 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB40X18SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 25 Pan Flange Pozi Stainless Steel (WN1411KB40X25SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-25-pan-flange-pozi-stainless-steel-wn1411kb40x25ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB40X25SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Flange Pozi Stainless Steel (WN1411KB40X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-flange-pozi-stainless-steel-wn1411kb40x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB40X8SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 10 Pan Flange Pozi Steel Zinc Plated (WN1411KB50X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-10-pan-flange-pozi-steel-zinc-plated-wn1411kb50x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB50X10Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 12 Pan Flange Pozi Steel Zinc Plated (WN1411KB50X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-12-pan-flange-pozi-steel-zinc-plated-wn1411kb50x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB50X12Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 14 Pan Flange Pozi Steel Zinc Plated (WN1411KB50X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-14-pan-flange-pozi-steel-zinc-plated-wn1411kb50x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB50X14Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 16 Pan Flange Pozi Stainless Steel (WN1411KB50X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-16-pan-flange-pozi-stainless-steel-wn1411kb50x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB50X16SS **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 20 Pan Flange Pozi Steel Zinc Plated (WN1411KB50X20Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-20-pan-flange-pozi-steel-zinc-plated-wn1411kb50x20z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB50X20Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 30 Pan Flange Pozi Steel Zinc Plated (WN1411KB50X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-30-pan-flange-pozi-steel-zinc-plated-wn1411kb50x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB50X30Z **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 8 Pan Flange Pozi Steel Zinc Plated Parker/S443Dcol-HD12.0 PSM#1604101995 (WN1411KB50X8SPE)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-8-pan-flange-pozi-steel-zinc-plated-parker-s443dcol-hd12-0-psm1604101995-wn1411kb50x8spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 13G2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB50X8SPE **Product Size:** 5 **Product Special Notes:** PARKER/S443DCOL-HD12.0 PSM#1604101995 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 8 Pan Flange Pozi Steel Black Zinc Plated (WN1411KB50X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-8-pan-flange-pozi-steel-black-zinc-plated-wn1411kb50x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A1, 38A2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB50X8ZB **Product Size:** 5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 7.0 X 30 Pan Flange Pozi Steel Zinc Plated (WN1411KB70X30Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-7-0-x-30-pan-flange-pozi-steel-zinc-plated-wn1411kb70x30z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB70X30Z **Product Size:** 7 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Flange Combo Steel Zinc Plated Pozi/Slot (WN1411KBL40X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-flange-combo-steel-zinc-plated-pozi-slot-wn1411kbl40x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Combo **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KBL40X16Z **Product Size:** 4 **Product Special Notes:** POZI/SLOT **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 4 Pan Flange Torx Steel Zinc Plated (WN1411KC18X4Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-4-pan-flange-torx-steel-zinc-plated-wn1411kc18x4z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC18X4Z **Product Size:** 1/8 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 1.8 X 8 Pan Flange Torx Steel Black Zinc Plated (W-6) (WN1411KC18X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-1-8-x-8-pan-flange-torx-steel-black-zinc-plated-w-6-wn1411kc18x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC18X8ZB **Product Size:** 1/8 **Product Special Notes:** (W-6) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 12 Pan Flange Torx 316 Stainless Steel (WN1411KC22X12S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-12-pan-flange-torx-316-stainless-steel-wn1411kc22x12s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC22X12S6 **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Flange Torx Stainless Steel (WN1411KC22X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-flange-torx-stainless-steel-wn1411kc22x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC22X8SS **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Flange Torx Steel Black Zinc Plated Ejot (WN1411KC22X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-flange-torx-steel-black-zinc-plated-ejot-wn1411kc22x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC22X8ZB **Product Size:** 2.2 **Product Special Notes:** EJOT **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Flange Torx Steel Black Zinc Plated (WN1411KC22X8ZBC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-flange-torx-steel-black-zinc-plated-wn1411kc22x8zbc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC22X8ZBC **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Flange Torx (T6) Steel Black Zinc Plated HD 6 (WN1411KC22X8ZBS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-flange-torx-t6-steel-black-zinc-plated-hd-6-wn1411kc22x8zbs/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T6) **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC22X8ZBS **Product Size:** 2.2 **Product Special Notes:** HD 6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Flange Torx Steel Zinc Plated (WN1411KC25X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-flange-torx-steel-zinc-plated-wn1411kc25x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC25X10Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 14 Pan Flange Torx Steel Zinc Plated (WN1411KC25X14Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-14-pan-flange-torx-steel-zinc-plated-wn1411kc25x14z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 3B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC25X14Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 18 Pan Flange Torx Steel Zinc Plated (WN1411KC25X18Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-18-pan-flange-torx-steel-zinc-plated-wn1411kc25x18z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC25X18Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Flange Torx Steel Zinc Plated (WN1411KC25X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-flange-torx-steel-zinc-plated-wn1411kc25x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 3B5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC25X6Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Flange Torx Steel Zinc Plated (WN1411KC25X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-flange-torx-steel-zinc-plated-wn1411kc25x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC25X8Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 8 Pan Flange Torx Steel Black Zinc Plated (WN1411KC25X8ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-8-pan-flange-torx-steel-black-zinc-plated-wn1411kc25x8zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC25X8ZB **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Flange Torx Stainless Steel (WN1411KC30X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-flange-torx-stainless-steel-wn1411kc30x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X10SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Flange Torx Steel Zinc Plated (WN1411KC30X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-flange-torx-steel-zinc-plated-wn1411kc30x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X10Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 10 Pan Flange Torx Steel Black Zinc Plated (WN1411KC30X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-10-pan-flange-torx-steel-black-zinc-plated-wn1411kc30x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 3B3 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X10ZB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Flange Torx Stainless Steel (WN1411KC30X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-flange-torx-stainless-steel-wn1411kc30x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 38A4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X12SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Flange Torx Steel Zinc Plated (WN1411KC30X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-flange-torx-steel-zinc-plated-wn1411kc30x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X12Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Pan Flange Torx (T10) Steel Zinc Plated HD 7MM (WN1411KC30X16SP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-pan-flange-torx-t10-steel-zinc-plated-hd-7mm-wn1411kc30x16sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X16SP **Product Size:** 3 **Product Special Notes:** HD 7MM **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 16 Pan Flange Torx (T10) Steel Zinc Plated (WN1411KC30X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-16-pan-flange-torx-t10-steel-zinc-plated-wn1411kc30x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X16Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Pan Flange Torx Stainless Steel Black Plated (WN1411KC30X25SB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-pan-flange-torx-stainless-steel-black-plated-wn1411kc30x25sb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X25SB **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Pan Flange Torx (T10) Stainless Steel Nickel Black Plated (WN1411KC30X25SN)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-pan-flange-torx-t10-stainless-steel-nickel-black-plated-wn1411kc30x25sn/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Nickel Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X25SN **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 25 Pan Flange Torx (T10) Steel Zinc Plated (WN1411KC30X25Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-25-pan-flange-torx-t10-steel-zinc-plated-wn1411kc30x25z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B4 **Product Default Location:** PSM **Product Drive Size:** (T10) **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X25Z **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 6 Pan Flange Torx Stainless Steel (WN1411KC30X6SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-6-pan-flange-torx-stainless-steel-wn1411kc30x6ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X6SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Flange Torx Stainless Steel (WN1411KC30X8SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-flange-torx-stainless-steel-wn1411kc30x8ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC30X8SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 16 Pan Flange Torx Stainless Steel (WN1411KC35X16SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-16-pan-flange-torx-stainless-steel-wn1411kc35x16ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC35X16SS **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Flange Torx 316 Stainless Steel (WN1411KC40X10S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-flange-torx-316-stainless-steel-wn1411kc40x10s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC40X10S6 **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Flange Torx Stainless Steel (WN1411KC40X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-flange-torx-stainless-steel-wn1411kc40x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC40X10SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Flange Torx Stainless Steel (WN1411KC40X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-flange-torx-stainless-steel-wn1411kc40x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC40X12SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Flange Torx Steel Black Zinc Plated (WN1411KC40X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-flange-torx-steel-black-zinc-plated-wn1411kc40x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC40X16ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 25 Pan Flange Torx Stainless Steel (WN1411KC40X25SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-25-pan-flange-torx-stainless-steel-wn1411kc40x25ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 8A5 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC40X25SS **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 8 Pan Flange Torx Steel Zinc Plated (WN1411KC40X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-8-pan-flange-torx-steel-zinc-plated-wn1411kc40x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 3B4 **Product Default Location:** PSM **Product Drive Type:** Torx **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC40X8Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 5.0 X 10 Pan Flange Torx To Drawing GME-0252-B7-X-V (WN1411KC50X10GM)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-5-0-x-10-pan-flange-torx-to-drawing-gme-0252-b7-x-v-wn1411kc50x10gm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Torx **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KC50X10GM **Product Size:** 5 **Product Special Notes:** TO DRAWING GME-0252-B7-X-V **Product Thread:** METRIC --- ### [Inserts For Plastics 6.32UNC X 5 Tech-Sonic Brass PSM#PSMc0235 (TECB6.32UNC-5)](https://psmfasteners.com/product/inserts-for-plastics-6-32unc-x-5-tech-sonic-brass-psmpsmc0235-tecb6-32unc-5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 6.32 **Product Special Notes:** PSM#PSMC0235 **Product Thread:** UNC --- ### [Inserts For Plastics M2 X 4 Tech-Sonic Brass (TECBM2)](https://psmfasteners.com/product/inserts-for-plastics-m2-x-4-tech-sonic-brass-tecbm2/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 2 **Product Thread:** METRIC --- ### [Inserts For Plastics M2 X 3 Tech-Sonic Brass (TECBM2-3.0)](https://psmfasteners.com/product/inserts-for-plastics-m2-x-3-tech-sonic-brass-tecbm2-3-0/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 2 **Product Thread:** METRIC --- ### [Inserts For Plastics M2 X 3.5 Tech-Sonic Brass (TECBM2-3.5)](https://psmfasteners.com/product/inserts-for-plastics-m2-x-3-5-tech-sonic-brass-tecbm2-3-5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3.5 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 2 **Product Thread:** METRIC --- ### [Inserts For Plastics M2 X 4MM Tech-Sonic Brass Insert (TECBM2.5-4MM)](https://psmfasteners.com/product/inserts-for-plastics-m2-x-4mm-tech-sonicc-brass-insert-tecbm2-5-4mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3.5 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 2 **Product Thread:** METRIC --- ### [Inserts For Plastics M3 X 5.7 Tech-Sonic Brass PSM04567 (TECBM3)](https://psmfasteners.com/product/inserts-for-plastics-m3-x-5-7-tech-sonic-brass-psm04567-tecbm3/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 5.7 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 3 **Product Special Notes:** PSM04567 **Product Thread:** METRIC --- ### [Inserts For Plastics M3 X 3.18 Tech-Sonic Brass PSM01716 (TECBM3-3.18MM)](https://psmfasteners.com/product/inserts-for-plastics-m3-x-3-18-tech-sonic-brass-psm01716-tecbm3-3-18mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3.18 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 3 **Product Special Notes:** PSM01716 **Product Thread:** METRIC --- ### [Inserts For Plastics M3 X 4.8 Tech-Sonic Brass PSM02032 (TECBM3-4.8MM)](https://psmfasteners.com/product/inserts-for-plastics-m3-x-4-8-tech-sonic-brass-psm02032-tecbm3-4-8mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 4.8 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 3 **Product Special Notes:** PSM02032 **Product Thread:** METRIC --- ### [Inserts For Plastics M3 X 8 Tech-Sonic Brass OAL 8.00MM - PSM021554 (TECBM3-8)](https://psmfasteners.com/product/inserts-for-plastics-m3-x-8-tech-sonic-brass-oal-8-00mm-psm021554-tecbm3-8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 3 **Product Special Notes:** OAL 8.00MM - PSM021554 **Product Thread:** METRIC --- ### [Inserts For Plastics M3.5 X 5 Tech-Sonic Brass PSMC0235 (TECBM3.5-OAL5.0)](https://psmfasteners.com/product/inserts-for-plastics-m3-5-x-5-tech-sonic-brass-psmc0235-tecbm3-5-oal5-0/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 3.5 **Product Special Notes:** PSMC0235 **Product Thread:** METRIC --- ### [Inserts For Plastics M3 X 4 Tech-Sonic Brass (TECBM34MM)](https://psmfasteners.com/product/inserts-for-plastics-m3-x-4-tech-sonic-brass-tecbm34mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 4 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 3 **Product Thread:** METRIC --- ### [Inserts For Plastics M4 X 8.1 Tech-Sonic Brass (TECBM4)](https://psmfasteners.com/product/inserts-for-plastics-m4-x-8-1-tech-sonic-brass-tecbm4/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 8.1 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 4 **Product Thread:** METRIC --- ### [Inserts For Plastics M4 X 4.8 Tech-Sonic Brass (TECBM4-4.8)](https://psmfasteners.com/product/inserts-for-plastics-m4-x-4-8-tech-sonic-brass-tecbm4-4-8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4.8 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 4 **Product Thread:** METRIC --- ### [Inserts For Plastics M4 X 5.8 Tech-Sonic Brass OAL 5.8MM (TECBM4-5.8)](https://psmfasteners.com/product/inserts-for-plastics-m4-x-5-8-tech-sonic-brass-oal-5-8mm-tecbm4-5-8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 5/8 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 4 **Product Special Notes:** OAL 5.8MM **Product Thread:** METRIC --- ### [Inserts For Plastics M4 X 5.8 Tech-Sonic Brass OAL 5.8 DRW BW -PSM025836 (TECBM4-5.8BW)](https://psmfasteners.com/product/inserts-for-plastics-m4-x-5-8-tech-sonic-brass-oal-5-8-drw-bw-psm025836-tecbm4-5-8bw/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5/8 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 4 **Product Special Notes:** OAL 5.8 DRW BW -PSM025836 **Product Thread:** METRIC --- ### [Inserts For Plastics M5 X 9.5 Tech-Sonic Brass PSM04571 (TECBM5)](https://psmfasteners.com/product/inserts-for-plastics-m5-x-9-5-tech-sonic-brass-psm04571-tecbm5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2, 38A2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 9.5 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 5 **Product Special Notes:** PSM04571 **Product Thread:** METRIC --- ### [Inserts For Plastics M6 X 12.7 Tech-Sonic Brass PSM04572 (TECBM6)](https://psmfasteners.com/product/inserts-for-plastics-m6-x-12-7-tech-sonic-brass-psm04572-tecbm6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 12.7 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 6 **Product Special Notes:** PSM04572 **Product Thread:** METRIC --- ### [Inserts For Plastics M6 6.8MM Tech-Sonic Brass (TECBM6-6.8MM)](https://psmfasteners.com/product/inserts-for-plastics-m6-6-8mm-tech-sonic-brass-tecbm6-6-8mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6.8MM **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 6 **Product Thread:** METRIC --- ### [Inserts For Plastics M8 X 12.7 Tech-Sonic Brass PSM04578 (TECBM8)](https://psmfasteners.com/product/inserts-for-plastics-m8-x-12-7-tech-sonic-brass-psm04578-tecbm8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 12.7 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 8 **Product Special Notes:** PSM04578 **Product Thread:** METRIC --- ### [Inserts For Plastics M3 X 6.4 Taper-X Brass Double Vane (TXBM3X6.4)](https://psmfasteners.com/product/inserts-for-plastics-m3-x-6-4-taper-x-brass-double-vane-txbm3x6-4/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TX series - Has been designed for those instances where fasteners must be installed into a 8? tapered hole. The combination of angled splines and upwardly directed vanes provide high torque and pull-out performance. **Content:** ## Advantages - Designed for use in an 8° tapered hole - High pull out performance - High torque resistance - Flange prevents escape of plastic - Can be installed by heat or ultrasonics - Self-aligning ## Selection of Inserts ![Diagram showing Taper-X single vane insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/single-vane-inserts.png) ![Diagram showing Taper X double vane insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/double-vane-inserts.png) ![Diagram showing Taper X Hole configuration](https://psmfasteners.com/wp-content/uploads/2025/07/taper-x-hole-config.png) ### Single Vane Metric ![Table showing Taper X singe vane insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/single-vane-metric-e1753318982121.png)Other lengths possible on quotation. ### Single Vane Unified ![Table showing Taper X single vane insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/single-vane-unified-e1753319090402.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Double Vane Metric ![Table showing Taper X double vane insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/double-vane-metric-e1753319505391.png)Other lengths possible on quotation. ### Double Vane Unified ![Table showing Taper X double vane insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/double-vane-unified-e1753319621324.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert ![Table showing how to specify Taper X inserts](https://psmfasteners.com/wp-content/uploads/2025/07/tape-x-specs-e1753319841229.png) ## Boss Design Specification #### Hole Preparation The taper on the hole should be 8° inclusive. The insert is tapered for approximately 1/3 of its length and is parallel for the remainder. Note: Blind Holes – hole depth should be a minimum of 1 mm or 0.039 inches greater than the length of the insert to be installed. #### Selection of Insert Type Depending on the depth of the hole, the holding power can be increased significantly by selecting the double vane version. #### Installation The fastener may be installed using either a pre-heating process or using heat generated by ultrasonic vibrations. Where preheating is used care must be exercised to ensure that the fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and could have a detrimental effect on performance. Insert must be installed flush to provide maximum performance. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Taper X Double Vane insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/taper-x-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6.4 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 3 **Product Special Notes:** DOUBLE VANE **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Pan Flange Phillips Steel Zinc Plated (WN1411KA22X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-pan-flange-phillips-steel-zinc-plated-wn1411ka22x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B1, 13G1 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA22X6Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 6 Pan Flange Phillips Steel Zinc Plated (6.5MM) (WN1411KA25X6ZSP)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-6-pan-flange-phillips-steel-zinc-plated-6-5mm-wn1411ka25x6zsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA25X6ZSP **Product Size:** 2.5 **Product Special Notes:** (6.5MM) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 12 Pan Flange Phillips Stainless Steel (WN1411KA30X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-12-pan-flange-phillips-stainless-steel-wn1411ka30x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 13G4 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA30X12SS **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 19.5 Pan Flange Phillips Steel Zinc Plated (WN1411KA30X19.5)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-19-5-pan-flange-phillips-steel-zinc-plated-wn1411ka30x19-5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 5B1 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 19.5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA30X19.5 **Product Size:** 3 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.0 X 8 Pan Flange Phillips 316 Stainless Steel (8MM) (E-POLISH) (WN1411KA30X8S6W)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-0-x-8-pan-flange-phillips-316-stainless-steel-8mm-e-polish-wn1411ka30x8s6w/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA30X8S6W **Product Size:** 3 **Product Special Notes:** (8MM) (E-POLISH) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 3.5 X 25 Pan Flange Phillips 316 Stainless Steel (E-POLISH) (WN1411KA35X25S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-3-5-x-25-pan-flange-phillips-316-stainless-steel-e-polish-wn1411ka35x25s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA35X25S6 **Product Size:** 3.5 **Product Special Notes:** (E-POLISH) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Flange Phillips Steel Zinc Plated (WN1411KA40X10-Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-flange-phillips-steel-zinc-plated-wn1411ka40x10-z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA40X10-Z **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Flange Phillips 316 Stainless Steel (E-POLISH) (WN1411KA40X10S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-flange-phillips-316-stainless-steel-e-polish-wn1411ka40x10s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA40X10S6 **Product Size:** 4 **Product Special Notes:** (E-POLISH) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 10 Pan Flange Phillips Steel Black Zinc Plated (WN1411KA40X10ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-10-pan-flange-phillips-steel-black-zinc-plated-wn1411ka40x10zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 10C8 **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA40X10ZB **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 12 Pan Flange Phillips Steel Yellow Zinc Plated (WN1411KA40X12ZC)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-12-pan-flange-phillips-steel-yellow-zinc-plated-wn1411ka40x12zc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA40X12ZC **Product Size:** 4 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 4.0 X 16 Pan Flange Phillips 316 Stainless Steel (E-POLISH) (WN1411KA40X16S6)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-4-0-x-16-pan-flange-phillips-316-stainless-steel-e-polish-wn1411ka40x16s6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** 316 Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA40X16S6 **Product Size:** 4 **Product Special Notes:** (E-POLISH) **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 16 Pan Flange Phillips Steel Black Zinc Plated (WN1411KA60X16ZB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-16-pan-flange-phillips-steel-black-zinc-plated-wn1411ka60x16zb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Black Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA60X16ZB **Product Size:** 6 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 6.0 X 16 Pan Flange Phillips Steel Nickel Black Plated Zn-Ni/Bl-120Hr (WN1411KA60X16ZNB)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-6-0-x-16-pan-flange-phillips-steel-nickel-black-plated-zn-ni-bl-120hr-wn1411ka60x16znb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Phillips **Product Finish:** Nickel Black Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KA60X16ZNB **Product Size:** 6 **Product Special Notes:** ZN-NI/BL-120HR **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 16 Pan Flange Pozi Steel Zinc Plated (WN1411KB22X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-16-pan-flange-pozi-steel-zinc-plated-wn1411kb22x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB22X16Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 5 Pan Flange Pozi Steel Zinc Plated (WN1411KB22X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-5-pan-flange-pozi-steel-zinc-plated-wn1411kb22x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB22X5Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 6 Pan Flange Pozi Steel Zinc Plated (WN1411KB22X6Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-6-pan-flange-pozi-steel-zinc-plated-wn1411kb22x6z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB22X6Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.2 X 8 Pan Flange Pozi Steel Zinc Plated (WN1411KB22X8Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-2-x-8-pan-flange-pozi-steel-zinc-plated-wn1411kb22x8z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB22X8Z **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Flange Pozi Stainless Steel (WN1411KB25X10SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-flange-pozi-stainless-steel-wn1411kb25x10ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X10SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 10 Pan Flange Pozi Steel Zinc Plated (WN1411KB25X10Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-10-pan-flange-pozi-steel-zinc-plated-wn1411kb25x10z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X10Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 12 Pan Flange Pozi Stainless Steel (WN1411KB25X12SS)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-12-pan-flange-pozi-stainless-steel-wn1411kb25x12ss/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 8A1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X12SS **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 12 Pan Flange Pozi Steel Zinc Plated (WN1411KB25X12Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-12-pan-flange-pozi-steel-zinc-plated-wn1411kb25x12z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X12Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 16 Pan Flange Pozi Steel Zinc Plated (WN1411KB25X16Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-16-pan-flange-pozi-steel-zinc-plated-wn1411kb25x16z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B2 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X16Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Thread Forming (PT) Screws For Plastics 2.5 X 5 Pan Flange Pozi Steel Zinc Plated (WN1411KB25X5Z)](https://psmfasteners.com/product/thread-forming-pt-screws-for-plastics-2-5-x-5-pan-flange-pozi-steel-zinc-plated-wn1411kb25x5z/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** PT SERIES - Designed for use in thermoplastics, its key design features include a profiled thread root to assist plastic flow, a 30 degree flank angle to reduce boss bursting forces and an 8 degree pitch angle. **Content:** ![PT screw](https://psmfasteners.com/wp-content/uploads/2025/07/blue-screw.png) The PT® SCREW is a direct screw fastener for use in thermoplastics. The key design aspects include a profiled thread root to assist plastic flow, a 30° flank angle to reduce boss bursting forces and an 8° pitch angle which combine to give low installation torques with high stripping torques. For those applications not requiring the high levels of thread re-use and high clamping torque (properties associated with threaded inserts) PT® screw offers an economical solution to plastics assembly and has distinct advantages over other direct screw fixings. ## Advantages - Reduced installation torque - High stripping torque - Greater safety margin between installation torque and stripping torque - High parent material shear strength - Minimises material flow resistance - Designed to reduce stress within the thermoplastic to an absolute minimum - High resistance to vibration and relaxation ## Design Guide ![Diagram showing PT series recommended boss design](https://psmfasteners.com/wp-content/uploads/2025/07/design-guide.png) When choosing a direct screw fixing, one of the major criteria is to obtain the maximum margin between driving torque and stripping torque. Screw design, material characteristics, molding practice, hole size and installation speed all have an influence. The specialised equipment necessary to measure the effect of these factors is available at P.S.M’s Technology Centre. This allows customers to obtain the best design possible. Pre-production testing is therefore strongly recommended. Please note the inclusion of a counterbore – this is important for the following reasons: 1. Prevents damage to the top of the boss 2. Helps alignment of the screw in the boss 3. Assists in repeated assemblies of the screw 4. Acts as a relief for any material extruded to the head of the screw and allows flush finishes. N.B. If molded tool design or application into an existing boss renders the recommended boss design impractical, please contact P.S.M for specific advice. ### 8° Optimum Pitch Angle ![A closeup view of the PT series thread](https://psmfasteners.com/wp-content/uploads/2025/07/pitch-angle-e1753235064748-300x166.png) - Lowest installation torque/highest stripping torque - Maximum resistance to vibration loosening and material relaxation in the component ### Profiled Thread Root ![Diagram showing comparison of Flat Root thread vs PT Profile Root thread](https://psmfasteners.com/wp-content/uploads/2025/07/thread-root-300x165.png) - Improved plastic flow reduces stress, providing long term reliability - Greater surface area contact between screw thread and plastic, to give a high shear and stripping torque - Lower installation torques ### 30° Combined Flank Angle ![Diagram showing comparison of 60° Flank Angel vs 30° Flank Angle](https://psmfasteners.com/wp-content/uploads/2025/07/flank-angle-300x185.png) - Lower radial stresses, reducing boss bursting force - Greater thread penetration into the plastic material, permitting enhanced clamping torque - Reduced centre of pressure, producing lower installation torque ## Design Recommendation [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation1.avif) [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-design-recommendation2.avif) ### Dimensions [ ![](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-new.avif) ### Standard Recess Styles Other available recesses are shown on optional features page. ![](https://psmfasteners.com/wp-content/uploads/2025/07/A-PHILLIPS.avif)A PHILLIPS ![](https://psmfasteners.com/wp-content/uploads/2025/07/2.png)B POZI ![Diagram showing PT Series Torx design](https://psmfasteners.com/wp-content/uploads/2025/07/3.png)C TORX® ![Diagram showing PT series Torx Plus design](https://psmfasteners.com/wp-content/uploads/2025/07/4.png)D TORX PLUS® #### Material Through hardened & tempered steel #### Standard Finishes 1. Zinc Plate and Clear Passivation (Z) 2. Zinc Plate and Chromate (ZC) 3. Zinc Plate and Black Chromate (ZBC) 4. Stainless Steel (SS) 5. Stainless Steel 316 (S6) #### Other Finishes Available to order ## Size Range [ ![Table showing PT series dimensions](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ](https://psmfasteners.com/wp-content/uploads/2025/07/pt-series-dimensions-e1754529980280.avif) ### How to Specify [ ![Table showing how to specify PT series screws](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/specifications.png) ## Assembly Data To determine the optimum performance of direct screw fixings there are a number of influential factors which have to be considered if problems on the production line or in service are to be avoided. In order to establish the optimum clamping torque it is first necessary to establish the following: 1. The amount of torque required to form the first thread. 2. The amount of torque required for the screwhead to come into contact with the mating component. 3. The amount of torque required for the joint to fail. These figures should be obtained by the use of specialised equipment which simulates production line conditions since testing by hand omits the important effect of friction due to installation speed. PSM’s Technology Centre is fully equipped to conduct these tests for you. The repeat torque accuracy of the installation tool can vary and should always be considered when specifying the recommended clamping torque. ![Diagram showing PT series screw penetration depth](https://psmfasteners.com/wp-content/uploads/2025/07/diagram.png) ### Recommended Installation Tool Speeds The speed at which screws are installed should be carefully considered – speeds which are too high can destroy the material into which the screws are being driven. Although a speed of 600rpm is recommended for most materials, pre-production testing and consultation with PSM should be undertaken for optimum results. **Brands:** PSM **Product categories:** Direct Screw Fixings For Plastics & Light Alloys, Uncategorized **Product Bin Location:** 6B1 **Product Default Location:** PSM **Product Drive Type:** Pozi **Product Finish:** Zinc Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Direct Screw Fixings For Plastics & Light Alloys **Product Product Type 2:** PT Series **Product Product Type 3:** Pan Flange **Product PSM Part Number:** WN1411KB25X5Z **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Spacers & Standoffs M8.4 X 10 Round Plain Hole Plain Stainless Steel 16 OD (SPA10SS8.4X16X10MM)](https://psmfasteners.com/product/spacers-and-standoffs-m8-4-x-10-round-plain-hole-plain-stainless-steel-16-od-spa10ss8-4x16x10mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 8.4 **Product Special Notes:** 16 OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M8.5 X 26 Round Plain Hole Plain Stainless Steel 16 OD (SPA10SS85-26MM)](https://psmfasteners.com/product/spacers-and-standoffs-m8-5-x-26-round-plain-hole-plain-stainless-steel-16-od-spa10ss85-26mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 26 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 8.5 **Product Special Notes:** 16 OD **Product Thread:** METRIC --- ### [Inserts For Plastics Spiro Brass 0Ba (SPB0BA)](https://psmfasteners.com/product/inserts-for-plastics-spiro-brass-0ba-spb0ba/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Special Notes:** 0BA --- ### [Inserts For Plastics 1/4UNC Spiro Brass (SPB14W)](https://psmfasteners.com/product/inserts-for-plastics-1-4unc-spiro-brass-spb14w/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 1/4 **Product Thread:** UNC --- ### [Inserts For Plastics 2 Spiro Brass 2Ba (SPB2BA)](https://psmfasteners.com/product/inserts-for-plastics-2-spiro-brass-2ba-spb2ba/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 2 **Product Special Notes:** 2BA --- ### [Inserts For Plastics 4 Spiro Brass 4Ba (SPB4BA)](https://psmfasteners.com/product/inserts-for-plastics-4-spiro-brass-4ba-spb4ba/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 4 **Product Special Notes:** 4BA --- ### [Inserts For Plastics 6.32UNC Spiro Brass (SPB6.32UNC)](https://psmfasteners.com/product/inserts-for-plastics-6-32unc-spiro-brass-spb6-32unc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 6.32 **Product Thread:** UNC --- ### [Inserts For Plastics 6.32UNC Spiro Brass Extruded Thread (SPB6.32UNC-ET)](https://psmfasteners.com/product/inserts-for-plastics-6-32unc-spiro-brass-extruded-thread-spb6-32unc-et/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 6.32 **Product Special Notes:** EXTRUDED THREAD **Product Thread:** UNC --- ### [Inserts For Plastics 8.32UNC Spiro Brass (SPB8.32 UNC)](https://psmfasteners.com/product/inserts-for-plastics-8-32unc-spiro-brass-spb8-32-unc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 8.32 **Product Thread:** UNC --- ### [Inserts For Plastics M10 X 9.2 Spiro Brass (SPBM10)](https://psmfasteners.com/product/inserts-for-plastics-m10-x-9-2-spiro-brass-spbm10/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 9.2 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 10 **Product Thread:** METRIC --- ### [Inserts For Plastics M2 X 4.1 Spiro Brass (SPBM2)](https://psmfasteners.com/product/inserts-for-plastics-m2-x-4-1-spiro-brass-spbm2/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 4.1 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 2 **Product Thread:** METRIC --- ### [Inserts For Plastics M2.5 X 5.3 Spiro Brass (SPBM2.5)](https://psmfasteners.com/product/inserts-for-plastics-m2-5-x-5-3-spiro-brass-spbm2-5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5.3 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Inserts For Plastics M3 X 5.3 Spiro Brass PSM04823 (SPBM3)](https://psmfasteners.com/product/inserts-for-plastics-m3-x-5-3-spiro-brass-psm04823-spbm3/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 5.3 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 3 **Product Special Notes:** PSM04823 **Product Thread:** METRIC --- ### [Inserts For Plastics M3.5 X 6.3 Spiro Brass (SPBM3.5)](https://psmfasteners.com/product/inserts-for-plastics-m3-5-x-6-3-spiro-brass-spbm3-5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 6.3 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 3.5 **Product Thread:** METRIC --- ### [Inserts For Plastics M4 X 7.4 Spiro Brass PSM04854 (SPBM4)](https://psmfasteners.com/product/inserts-for-plastics-m4-x-7-4-spiro-brass-psm04854-spbm4/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 7.4 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 4 **Product Special Notes:** PSM04854 **Product Thread:** METRIC --- ### [Inserts For Plastics M5 X 8.3 Spiro Brass PSM04857 (SPBM5)](https://psmfasteners.com/product/inserts-for-plastics-m5-x-8-3-spiro-brass-psm04857-spbm5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 8.3 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 5 **Product Special Notes:** PSM04857 **Product Thread:** METRIC --- ### [Inserts For Plastics M6 X 9.2 Spiro Brass PSM04858 (SPBM6)](https://psmfasteners.com/product/inserts-for-plastics-m6-x-9-2-spiro-brass-psm04858-spbm6/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 9.2 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 6 **Product Special Notes:** PSM04858 **Product Thread:** METRIC --- ### [Inserts For Plastics M8 X 9.2 Spiro Brass (SPBM8)](https://psmfasteners.com/product/inserts-for-plastics-m8-x-9-2-spiro-brass-spbm8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type SP & HSR series and Stud Type SPTS & SPHS series - Designed to cope with the difficulties presented by hard brittle thermoset materials. The sharp precision knurl pattern cuts into these materials reducing radial stresses and allowing thinner boss walls than many other inserts. **Content:** ## Advantages - Easy press-in insertion - High torque resistance - Low bursting stress allows the use of thinner wall bosses reducing the risk of sink marks - Self-aligning – Assists installation ## Selection of Insert or Stud ![Diagram showing Spiro insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-inserts.png) ![Diagram showing Spiro headed insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-inserts.png) ![Diagram showing Spiro stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-stud.png) ![Diagram showing Spiro headed stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-headed-stud.png) ### ISO Metric ![Table showing Spiro insert metric data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-iso-metric-e1753326602208.png)Other lengths possible on quotation. ### Unified ![Table showing Spiro insert unified data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-unified-e1753326742171.png)STANDARD MATERIAL: BRASS (B) Other materials and lenghts possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Spiro inserts](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-specs-e1753326905672.png) ## Boss Design Specification #### Hole Preparation Holes for Spiro inserts should be molded to remove the danger of drill induced stresses. The taper on a molded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0.10mm. #### Installation The insert must be installed using a squeeze action press, NEVER a hammer blow. The insert must be allowed to rotate in the direction of the knurl during installation. This is best achieved by the use of a punch having either a polished face or a thrust bearing. The insert must be kept axially square during installation, as any tilting will induce side loads on the boss wall. The recommended hole size must not be increased beyond the top tolerance limit since oversize holes reduce or remove the self-aligning effects, producing side loads and consequent risk of boss cracking. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range. ![Graph showing Spiro insert performance data](https://psmfasteners.com/wp-content/uploads/2025/07/spiro-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 9.2 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Spiro **Product Size:** 8 **Product Thread:** METRIC --- ### [Inserts For Plastics 4.40UNC X 5.69 Tech-Sonic Brass OAL 5.69 C/B PSM016374 (TECB4.40UNC)](https://psmfasteners.com/product/inserts-for-plastics-4-40unc-x-5-69-tech-sonic-brass-oal-5-69-c-b-psm016374-tecb4-40unc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5.69 **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 4.4 **Product Special Notes:** OAL 5.69 C/B PSM016374 **Product Thread:** UNC --- ### [Inserts For Plastics 6.32UNC Tech-Sonic Brass PSM017270 (TECB6.32UNC)](https://psmfasteners.com/product/inserts-for-plastics-6-32unc-tech-sonic-brass-psm017270-tecb6-32unc/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** Insert Type TEC series & Stud Type TCTS series - Features a unique combination of opposed knurls and knurled vanes providing increased performance levels, even over the Sonic-Lok insert. Installation is simplified by the symmetrical nature of theinsert, eliminating the need for orientation during automated or hand feeding. **Content:** ## Advantages - Double ended – assists automatic feeding - Increased pull out and torque performance - Self-aligning – assists installation - Permits thin boss walls allowing compact boss design - Choice of lengths available ## Selection of Inserts ![Diagram showing Tech Sonic insert measurements](https://psmfasteners.com/wp-content/uploads/2025/07/inserts-1-tech-sonic.png) ![Diagram showing Tech Sonic stud measurements](https://psmfasteners.com/wp-content/uploads/2025/07/studs-tech-sonic2.png) ### ISO Metric [ ![Table showing Tech Sonic ISO metric data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-iso-metrics-e1753313999529.png)Other lengths possible on quotation. ### Unified [ ![Table showing Tech Sonic unified data](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png) ](https://psmfasteners.com/wp-content/uploads/2025/07/unified-e1753314106603.png)STANDARD MATERIAL: BRASS (B) Other materials and lengths possible on quotation. ### Specifying an Insert & Stud ![Table showing how to specify Tech Sonic inserts](https://psmfasteners.com/wp-content/uploads/2025/07/specifying-an-insert-tech-sonic-e1753314292695.png) ## Boss Design Specification #### Hole Preparation Molded holes are recommended wherever possible. The taper on a molded hole should be 0. 5° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance:-0.00 +0.10mm. #### Installation The Fastener has been designed for installation using a pre-heating process. Care must be exercised to ensure that the Fastener softens but does not melt the plastic. This will avoid any tendency to generate unsightly “flash” around the top of the insert and ensure optimum performance. Excessive pressure should be avoided since this may result in the insert being forced into the hole without allowing the plastic to soften and flow around the surface profile. #### Wall Thickness A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre-production testing is strongly advised. #### Performance Data The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and shows the relative performance of the inserts in the range. ![Graph showing Tech Sonic performance data](https://psmfasteners.com/wp-content/uploads/2025/07/tech-sonic-line-chart.png) **Brands:** PSM **Product categories:** Inserts For Plastics **Product Bin Location:** 7B2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Material:** Brass **Product Product Type 1:** Inserts For Plastics **Product Product Type 2:** Tech-Sonic **Product Size:** 6.32 **Product Special Notes:** PSM017270 **Product Thread:** UNC --- ### [Spacers & Standoffs M4.2 X 10 Round Plain Hole Plain Acetal (SPA10AC4410MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-10-round-plain-hole-plain-acetal-spa10ac4410mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 12.5 Round Plain Hole Plain Acetal (SPA10AC4412.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-12-5-round-plain-hole-plain-acetal-spa10ac4412-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 12 Round Plain Hole Plain Acetal (SPA10AC4412MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-12-round-plain-hole-plain-acetal-spa10ac4412mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 13 Round Plain Hole Plain Acetal OD 6.00MM (SPA10AC4413MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-13-round-plain-hole-plain-acetal-od-6-00mm-spa10ac4413mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 13 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Special Notes:** OD 6.00MM **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 14 Round Plain Hole Plain Acetal 6MM Body (SPA10AC4414MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-14-round-plain-hole-plain-acetal-6mm-body-spa10ac4414mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Special Notes:** 6MM BODY **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 16 Round Plain Hole Plain Acetal (SPA10AC4416MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-16-round-plain-hole-plain-acetal-spa10ac4416mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 18 Round Plain Hole Plain Acetal (SPA10AC4418MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-18-round-plain-hole-plain-acetal-spa10ac4418mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 18 Round Plain Hole Plain Acetal Hole 5.2MM (SPA10AC4418MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-18-round-plain-hole-plain-acetal-hole-5-2mm-spa10ac4418mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 18 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Special Notes:** HOLE 5.2MM **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 20 Round Plain Hole Plain Acetal (SPA10AC4420MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-20-round-plain-hole-plain-acetal-spa10ac4420mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 25 Round Plain Hole Plain Acetal (SPA10AC4425MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-25-round-plain-hole-plain-acetal-spa10ac4425mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 31.8 Round Plain Hole Plain Acetal 6.4 Od (SPA10AC4431.8SP)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-31-8-round-plain-hole-plain-acetal-6-4-od-spa10ac4431-8sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 31.8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Special Notes:** 6.4 OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 3 Round Plain Hole Plain Acetal (SPA10AC443MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-3-round-plain-hole-plain-acetal-spa10ac443mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 49 Round Plain Hole Plain Acetal 5.2MM I/D (SPA10AC4449MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-49-round-plain-hole-plain-acetal-5-2mm-i-d-spa10ac4449mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 49 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Special Notes:** 5.2MM I/D **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 4 Round Plain Hole Plain Acetal (SPA10AC444MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-4-round-plain-hole-plain-acetal-spa10ac444mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 4 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 5 Round Plain Hole Plain Acetal (SPA10AC445MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-5-round-plain-hole-plain-acetal-spa10ac445mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 6 Round Plain Hole Plain Acetal (SPA10AC446MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-6-round-plain-hole-plain-acetal-spa10ac446mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 8 Round Plain Hole Plain Acetal (SPA10AC448MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-8-round-plain-hole-plain-acetal-spa10ac448mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5 X 5.5 Round Plain Hole Plain Acetal (SPA10AC55.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-x-5-5-round-plain-hole-plain-acetal-spa10ac55-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 10 Round Plain Hole Plain Acetal (SPA10AC5510MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-10-round-plain-hole-plain-acetal-spa10ac5510mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 14 Round Plain Hole Plain Acetal (SPA10AC5514MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-14-round-plain-hole-plain-acetal-spa10ac5514mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 16 Round Plain Hole Plain Acetal (SPA10AC5516MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-16-round-plain-hole-plain-acetal-spa10ac5516mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 32 Round Plain Hole Plain Acetal (SPA10AC5532MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-32-round-plain-hole-plain-acetal-spa10ac5532mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 32 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 3 Round Plain Hole Plain Acetal (SPA10AC553MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-3-round-plain-hole-plain-acetal-spa10ac553mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 4 Round Plain Hole Plain Acetal (SPA10AC554MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-4-round-plain-hole-plain-acetal-spa10ac554mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 4 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 6 Round Plain Hole Plain Acetal (SPA10AC556MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-6-round-plain-hole-plain-acetal-spa10ac556mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 6 Round Plain Hole Plain Acetal Black 8.0 OD (SPA10AC556MMSPE)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-6-round-plain-hole-plain-acetal-black-8-0-od-spa10ac556mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Finish:** Black **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Special Notes:** 8.0 OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 7.1 Round Plain Hole Plain Acetal 9OD (SPA10AC557.1MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-7-1-round-plain-hole-plain-acetal-9od-spa10ac557-1mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7.1 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Special Notes:** 9OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 8 Round Plain Hole Plain Acetal (SPA10AC558MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-8-round-plain-hole-plain-acetal-spa10ac558mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 12.7 Round Plain Hole Plain Acetal (SPA10AC55X12.7)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-12-7-round-plain-hole-plain-acetal-spa10ac55x12-7/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 12.7 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 12 Round Plain Hole Plain Nylon 13MM OD (SPA10AC64X12X13-B)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-12-round-plain-hole-plain-nylon-13mm-od-spa10ac64x12x13-b/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Special Notes:** 13MM OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 10 Round Plain Hole Plain Acetal (SPA10AC6610MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-10-round-plain-hole-plain-acetal-spa10ac6610mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 15 Round Plain Hole Plain Acetal (SPA10AC6615MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-15-round-plain-hole-plain-acetal-spa10ac6615mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 15 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 16 Round Plain Hole Plain Acetal (SPA10AC6616MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-16-round-plain-hole-plain-acetal-spa10ac6616mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 18 Round Plain Hole Plain Acetal (SPA10AC6618MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-18-round-plain-hole-plain-acetal-spa10ac6618mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 20 Round Plain Hole Plain Acetal (SPA10AC6620MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-20-round-plain-hole-plain-acetal-spa10ac6620mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 28 Round Plain Hole Plain Acetal (SPA10AC6628MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-28-round-plain-hole-plain-acetal-spa10ac6628mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 28 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 30 Round Plain Hole Plain Acetal (SPA10AC6630MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-30-round-plain-hole-plain-acetal-spa10ac6630mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 4 Round Plain Hole Plain Acetal (SPA10AC664MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-4-round-plain-hole-plain-acetal-spa10ac664mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M6.4 X 8.7 Round Plain Hole Plain Acetal (SPA10AC66X8.7MM)](https://psmfasteners.com/product/spacers-and-standoffs-m6-4-x-8-7-round-plain-hole-plain-acetal-spa10ac66x8-7mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8.7 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 6.4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M8.2 X 3 Round Plain Hole Plain Acetal (SPA10AC883MM)](https://psmfasteners.com/product/spacers-and-standoffs-m8-2-x-3-round-plain-hole-plain-acetal-spa10ac883mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 8.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3 X 10 Round Plain Hole Plain Acetal (SPA10ACM310MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-x-10-round-plain-hole-plain-acetal-spa10acm310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 7.2 Round Plain Hole Plain Acetal (SPA10ACM337.2MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-7-2-round-plain-hole-plain-acetal-spa10acm337-2mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7.2 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3 X 8 Round Plain Hole Plain Acetal (SPA10ACM38MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-x-8-round-plain-hole-plain-acetal-spa10acm38mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4 X 5 Round Plain Hole Plain Acetal (SPA10ACM45MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-x-5-round-plain-hole-plain-acetal-spa10acm45mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.1 X 14 Round Plain Hole Plain Aluminium 6.6 OD (SPA10AL3114MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-1-x-14-round-plain-hole-plain-aluminium-6-6-od-spa10al3114mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Aluminum **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.1 **Product Special Notes:** 6.6 OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 6 Round Plain Hole Plain Aluminium (SPA10AL336MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-6-round-plain-hole-plain-aluminium-spa10al336mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Aluminum **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.7 X 11.5 Round Plain Hole Plain Brass Nickel Plated 7.9 (SPA10B-4.7-11.5)](https://psmfasteners.com/product/spacers-and-standoffs-m4-7-x-11-5-round-plain-hole-plain-brass-nickel-plated-7-9-spa10b-4-7-11-5/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 11.5 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.7 **Product Special Notes:** 7.9 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.6 X 10 Round Plain Hole Plain Brass Nickel Plated 5.0OD (SPA10B2510MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-6-x-10-round-plain-hole-plain-brass-nickel-plated-5-0od-spa10b2510mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.6 **Product Special Notes:** 5.0OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.6 X 3 Round Plain Hole Plain Brass Nickel Plated 5.0 OD (SPA10B253MM-SPE)](https://psmfasteners.com/product/spacers-and-standoffs-m2-6-x-3-round-plain-hole-plain-brass-nickel-plated-5-0-od-spa10b253mm-spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 3 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.6 **Product Special Notes:** 5.0 OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.7 X 5.5 Round Plain Hole Plain Brass Nickel Plated 4.760D (SPA10B255.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-7-x-5-5-round-plain-hole-plain-brass-nickel-plated-4-760d-spa10b255-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17A4 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5.5 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.7 **Product Special Notes:** 4.760D **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 312 Round Plain Hole Plain Brass Nickel Plated (SPA10B3312MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-312-round-plain-hole-plain-brass-nickel-plated-spa10b3312mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 312 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 2 Round Plain Hole Plain Brass Nickel Plated (OD-6.0) (SPA10B332MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-2-round-plain-hole-plain-brass-nickel-plated-od-6-0-spa10b332mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17A3 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 2 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** (OD-6.0) **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 3 Round Plain Hole Plain Brass Nickel Plated (OD-6.0) (SPA10B333MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-3-round-plain-hole-plain-brass-nickel-plated-od-6-0-spa10b333mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17A4 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 3 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** (OD-6.0) **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 5 Round Plain Hole Plain Brass Nickel Plated (OD 4.76) (SPA10B335MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-5-round-plain-hole-plain-brass-nickel-plated-od-4-76-spa10b335mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17A3 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** (OD 4.76) **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 6 Round Plain Hole Plain Brass (6.0MM OD) (SPA10B336MM-P)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-6-round-plain-hole-plain-brass-6-0mm-od-spa10b336mm-p/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17A3 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** (6.0MM OD) **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 6 Round Plain Hole Brass Nickel Plated (OD 4.76) (SPA10B336MM-SPE)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-6-round-plain-hole-brass-nickel-plated-od-4-76-spa10b336mm-spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17A3 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** (OD 4.76) **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 7 Round Plain Hole Plain Brass Nickel Plated (OD4.76) (SPA10B337MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-7-round-plain-hole-plain-brass-nickel-plated-od4-76-spa10b337mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17A4 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** (OD4.76) **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 11 Round Plain Hole Plain Brass Nickel Plated (SPA10B4411MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-11-round-plain-hole-plain-brass-nickel-plated-spa10b4411mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 11 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 19 Round Plain Hole Plain Brass Nickel Plated (SPA10B4419MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-19-round-plain-hole-plain-brass-nickel-plated-spa10b4419mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 4A4 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 19 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 19 Round Plain Hole Plain Brass (SPA10B4419MMSPE)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-19-round-plain-hole-plain-brass-spa10b4419mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 19 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 7 Round Plain Hole Plain Brass Nickel Plated (SPA10B447MM)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-7-round-plain-hole-plain-brass-nickel-plated-spa10b447mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 10 Round Plain Hole Plain Brass Nickel Plated 12.7OD (SPA10B5510MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-10-round-plain-hole-plain-brass-nickel-plated-12-7od-spa10b5510mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Special Notes:** 12.7OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.5 X 2.5 Round Plain Hole Plain Brass Nickel Plated (4MM OD) (SPA10BM2.52.5SP)](https://psmfasteners.com/product/spacers-and-standoffs-m2-5-x-2-5-round-plain-hole-plain-brass-nickel-plated-4mm-od-spa10bm2-52-5sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 2.5 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.5 **Product Special Notes:** (4MM OD) **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 10 Round Plain Hole Plain Nylon Black (SPA10N3310MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-10-round-plain-hole-plain-nylon-black-spa10n3310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Finish:** Black **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 3.18 Round Plain Hole Plain Nylon (SPA10N333.18MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-3-18-round-plain-hole-plain-nylon-spa10n333-18mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3.18 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M7 X 35 Round Plain Hole Plain Nylon 19.05OD (SPA10N7.0-35SPE)](https://psmfasteners.com/product/spacers-and-standoffs-m7-x-35-round-plain-hole-plain-nylon-19-05od-spa10n7-0-35spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 7 **Product Special Notes:** 19.05OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 6 Round Plain Hole Plain Steel Zinc Plated OD 6 (SPA10S33-6MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-6-round-plain-hole-plain-steel-zinc-plated-od-6-spa10s33-6mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** OD 6 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 5 Round Plain Hole Plain Steel Nickel Plated (SPA10S335MM-N)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-5-round-plain-hole-plain-steel-nickel-plated-spa10s335mm-n/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 36 Round Plain Hole Plain Steel Zinc Plated 6.0OD (SPA10S336MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-36-round-plain-hole-plain-steel-zinc-plated-6-0od-spa10s336mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 36 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** 6.0OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 10 Round Plain Hole Plain Steel Yellow Zinc Plated (SPA10S5510MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-10-round-plain-hole-plain-steel-yellow-zinc-plated-spa10s5510mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M8.2 X 16 Round Plain Hole Plain Steel (SPA10S88-16MM)](https://psmfasteners.com/product/spacers-and-standoffs-m8-2-x-16-round-plain-hole-plain-steel-spa10s88-16mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 8.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M8.2 X 26 Round Plain Hole Plain Steel 16 OD (SPA10S88-26MM)](https://psmfasteners.com/product/spacers-and-standoffs-m8-2-x-26-round-plain-hole-plain-steel-16-od-spa10s88-26mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 26 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 8.2 **Product Special Notes:** 16 OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M7 X 10 Round Plain Hole Plain Steel Zinc Plated (SPA10SM710MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m7-x-10-round-plain-hole-plain-steel-zinc-plated-spa10sm710mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 7 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 14 Round Plain Hole Plain Stainless Steel 8MM DIA (SPA10SS3314SP)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-14-round-plain-hole-plain-stainless-steel-8mm-dia-spa10ss3314sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** 8MM DIA **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 15.3 Round Plain Hole Plain Stainless Steel 8MM DIA (SPA10SS3315.3SP)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-15-3-round-plain-hole-plain-stainless-steel-8mm-dia-spa10ss3315-3sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 15.3 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** 8MM DIA **Product Thread:** METRIC --- ### [Spacers & Standoffs M4.2 X 3.1 Round Plain Hole Plain Stainless Steel OD 15 (SPA10SS42X3.1)](https://psmfasteners.com/product/spacers-and-standoffs-m4-2-x-3-1-round-plain-hole-plain-stainless-steel-od-15-spa10ss42x3-1/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3.1 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 4.2 **Product Special Notes:** OD 15 **Product Thread:** METRIC --- ### [Spacers & Standoffs M5.2 X 10.6 Round Plain Hole Plain Stainless Steel DRW 011512 (SPA10SS5510.6MM)](https://psmfasteners.com/product/spacers-and-standoffs-m5-2-x-10-6-round-plain-hole-plain-stainless-steel-drw-011512-spa10ss5510-6mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10.6 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 5.2 **Product Special Notes:** DRW 011512 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 10 Round Male / Female Nylon 10353 (SPA05NM310MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-10-round-male-female-nylon-10353-spa05nm310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Special Notes:** 10353 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 5 Round Male / Male Acetal (SPA06ACM35MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-5-round-male-male-acetal-spa06acm35mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 7 Round Male / Male Acetal 4MM/6MM Studs (SPA06ACM37MMSPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-7-round-male-male-acetal-4mm-6mm-studs-spa06acm37mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Special Notes:** 4MM/6MM STUDS **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 8 Round Male / Male Acetal (SPA06ACM38MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-8-round-male-male-acetal-spa06acm38mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 10 Round Male / Male Acetal (SPA06ACM410MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-10-round-male-male-acetal-spa06acm410mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 20 Round Male / Male Acetal (SPA06ACM420MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-20-round-male-male-acetal-spa06acm420mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 30 Round Male / Male Acetal (SPA06ACM430MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-30-round-male-male-acetal-spa06acm430mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 14 High Strength Insulating Female / Female Acetal (SPA07ABM314MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-14-high-strength-insulating-female-female-acetal-spa07abm314mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 20 High Strength Insulating Female / Female Acetal (SPA07ABM320MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-20-high-strength-insulating-female-female-acetal-spa07abm320mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 25 High Strength Insulating Female / Female Acetal (SPA07ABM325MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-25-high-strength-insulating-female-female-acetal-spa07abm325mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 30 High Strength Insulating Female / Female Acetal (SPA07ABM330MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-30-high-strength-insulating-female-female-acetal-spa07abm330mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 25 High Strength Insulating Female / Female Acetal (SPA07ABM525MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-25-high-strength-insulating-female-female-acetal-spa07abm525mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F8 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Female / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 12 High Strength Insulating Male / Female Acetal (SPA08ABM312MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-12-high-strength-insulating-male-female-acetal-spa08abm312mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 35 High Strength Insulating Male / Female Acetal (SPA08ABM335MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-35-high-strength-insulating-male-female-acetal-spa08abm335mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 14 High Strength Insulating Male / Female Acetal (SPA08ABM414MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-14-high-strength-insulating-male-female-acetal-spa08abm414mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 16 High Strength Insulating Male / Female Acetal (SPA08ABM416MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-16-high-strength-insulating-male-female-acetal-spa08abm416mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 20 High Strength Insulating Male / Female Acetal (SPA08ABM420MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-20-high-strength-insulating-male-female-acetal-spa08abm420mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 30 High Strength Insulating Male / Female Acetal (SPA08ABM430MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-30-high-strength-insulating-male-female-acetal-spa08abm430mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 40 High Strength Insulating Male / Female Acetal (SPA08ABM440MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-40-high-strength-insulating-male-female-acetal-spa08abm440mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 30 High Strength Insulating Male / Male Acetal (SPA09ABM430MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-30-high-strength-insulating-male-male-acetal-spa09abm430mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 50 High Strength Insulating Male / Male Acetal (SPA09ABM450MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-50-high-strength-insulating-male-male-acetal-spa09abm450mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 50 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 10 High Strength Insulating Male / Male Acetal (SPA09ACM310MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-10-high-strength-insulating-male-male-acetal-spa09acm310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 20 High Strength Insulating Male / Male Acetal (SPA09ACM420MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-20-high-strength-insulating-male-male-acetal-spa09acm420mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 07/08/09 High Strength Insulating Spacers & Standoffs - Acetal Spacers & Standoffs incorporating permanently retained brass Inserts or studs - High strength re-useable threads. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** High Strength Insulating Spacers **Product Size:** 4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3 X 8 Round Plain Hole Plain Nylon (SPA10302)](https://psmfasteners.com/product/spacers-and-standoffs-m3-x-8-round-plain-hole-plain-nylon-spa10302/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M7 X 8 Round Plain Hole Plain Aluminium 10MM OD (SPA10A7X10X8)](https://psmfasteners.com/product/spacers-and-standoffs-m7-x-8-round-plain-hole-plain-aluminium-10mm-od-spa10a7x10x8/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Aluminum **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 7 **Product Special Notes:** 10MM OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M10.5 X 10 Round Plain Hole Plain Acetal 16 OD (SPA10AC101010MM)](https://psmfasteners.com/product/spacers-and-standoffs-m10-5-x-10-round-plain-hole-plain-acetal-16-od-spa10ac101010mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 10.5 **Product Special Notes:** 16 OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.2 X 10 Round Plain Hole Plain Acetal (SPA10AC2210MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-2-x-10-round-plain-hole-plain-acetal-spa10ac2210mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.2 X 16 Round Plain Hole Plain Acetal (SPA10AC2216MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-2-x-16-round-plain-hole-plain-acetal-spa10ac2216mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.2 X 2 Round Plain Hole Plain Acetal (SPA10AC222MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-2-x-2-round-plain-hole-plain-acetal-spa10ac222mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 2 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.2 X 5 Round Plain Hole Plain Acetal (SPA10AC225MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-2-x-5-round-plain-hole-plain-acetal-spa10ac225mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.2 X 6 Round Plain Hole Plain Acetal (SPA10AC226MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-2-x-6-round-plain-hole-plain-acetal-spa10ac226mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.2 X 8.5 Round Plain Hole Plain Acetal (SPA10AC228.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-2-x-8-5-round-plain-hole-plain-acetal-spa10ac228-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.2 X 8 Round Plain Hole Plain Acetal (SPA10AC228MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-2-x-8-round-plain-hole-plain-acetal-spa10ac228mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.5 X 2 Round Plain Hole Plain Acetal OD 5 (SPA10AC25-2MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-5-x-2-round-plain-hole-plain-acetal-od-5-spa10ac25-2mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 2 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.5 **Product Special Notes:** OD 5 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.5 X 10 Round Plain Hole Plain Acetal (SPA10AC2510MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-5-x-10-round-plain-hole-plain-acetal-spa10ac2510mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.5 X 10 Round Plain Hole Plain Acetal Black (SPA10AC2510MMB)](https://psmfasteners.com/product/spacers-and-standoffs-m2-5-x-10-round-plain-hole-plain-acetal-black-spa10ac2510mmb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Black **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.5 X 2.5 Round Plain Hole Plain Acetal OD=4.0MM (SPA10AC252.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-5-x-2-5-round-plain-hole-plain-acetal-od-4-0mm-spa10ac252-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 2.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.5 **Product Special Notes:** OD=4.0MM **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.5 X 2 Round Plain Hole Plain Acetal Black (SPA10AC252MMB)](https://psmfasteners.com/product/spacers-and-standoffs-m2-5-x-2-round-plain-hole-plain-acetal-black-spa10ac252mmb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Finish:** Black **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 2 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.5 X 3.8 Round Plain Hole Plain Acetal (SPA10AC253.8MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-5-x-3-8-round-plain-hole-plain-acetal-spa10ac253-8mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 3/8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.2 X 3 Round Plain Hole Plain Acetal 5MM OD P/N 13Me011 (SPA10AC253MM)](https://psmfasteners.com/product/spacers-and-standoffs-m2-2-x-3-round-plain-hole-plain-acetal-5mm-od-p-n-13me011-spa10ac253mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 3 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.2 **Product Special Notes:** 5MM OD P/N 13ME011 **Product Thread:** METRIC --- ### [Spacers & Standoffs M2.5 X 4 Round Plain Hole Plain Nylon Black (SPA10AC254MMB)](https://psmfasteners.com/product/spacers-and-standoffs-m2-5-x-4-round-plain-hole-plain-nylon-black-spa10ac254mmb/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Finish:** Black **Product Lead Time:** Same Day **Product Length/Dimension:** 4 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.7 X 6 Round Plain Hole Plain Acetal (SPA10AC3.76MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-7-x-6-round-plain-hole-plain-acetal-spa10ac3-76mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.7 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 5 Round Plain Hole Plain Acetal 5MM OD (SPA10AC33-5MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-5-round-plain-hole-plain-acetal-5mm-od-spa10ac33-5mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** 5MM OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 10 Round Plain Hole Plain Acetal (SPA10AC3310MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-10-round-plain-hole-plain-acetal-spa10ac3310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 10 Round Plain Hole Plain Nylon 60D (SPA10AC3310MM#)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-10-round-plain-hole-plain-nylon-60d-spa10ac3310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** 60D **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 12.5 Round Plain Hole Plain Acetal (SPA10AC3312.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-12-5-round-plain-hole-plain-acetal-spa10ac3312-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 12 Round Plain Hole Plain Acetal (SPA10AC3312MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-12-round-plain-hole-plain-acetal-spa10ac3312mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 14 Round Plain Hole Plain Acetal (SPA10AC3314MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-14-round-plain-hole-plain-acetal-spa10ac3314mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 15 Round Plain Hole Plain Acetal (SPA10AC3315MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-15-round-plain-hole-plain-acetal-spa10ac3315mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 15 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 16 Round Plain Hole Plain Acetal (SPA10AC3316MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-16-round-plain-hole-plain-acetal-spa10ac3316mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 18 Round Plain Hole Plain Acetal (SPA10AC3318MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-18-round-plain-hole-plain-acetal-spa10ac3318mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 18 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 2.7 Round Plain Hole Plain Acetal Black (SPA10AC332.7MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-2-7-round-plain-hole-plain-acetal-black-spa10ac332-7mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Finish:** Black **Product Lead Time:** Same Day **Product Length/Dimension:** 2.7 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 20 Round Plain Hole Plain Acetal (SPA10AC3320MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-20-round-plain-hole-plain-acetal-spa10ac3320mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 25 Round Plain Hole Plain Acetal (SPA10AC3325MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-25-round-plain-hole-plain-acetal-spa10ac3325mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 2 Round Plain Hole Plain Acetal (SPA10AC332MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-2-round-plain-hole-plain-acetal-spa10ac332mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 2 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 4.3 Round Plain Hole Plain Acetal (SPA10AC334.3MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-4-3-round-plain-hole-plain-acetal-spa10ac334-3mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4.3 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 4.5 Round Plain Hole Plain Acetal (SPA10AC334.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-4-5-round-plain-hole-plain-acetal-spa10ac334-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 4.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 4 Round Plain Hole Plain Acetal (SPA10AC334MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-4-round-plain-hole-plain-acetal-spa10ac334mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 4 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 5.5 Round Plain Hole Plain Acetal (SPA10AC335.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-5-5-round-plain-hole-plain-acetal-spa10ac335-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 5.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 5 Round Plain Hole Plain Acetal (SPA10AC335MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-5-round-plain-hole-plain-acetal-spa10ac335mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 5 Round Plain Hole Plain Nylon 60D (SPA10AC335MM#)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-5-round-plain-hole-plain-nylon-60d-spa10ac335mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** 60D **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 5 Round Plain Hole Plain Acetal 5.00D (SPA10AC335MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-5-round-plain-hole-plain-acetal-5-00d-spa10ac335mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** 5.00D **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 6 Round Plain Hole Plain Acetal (SPA10AC336MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-6-round-plain-hole-plain-acetal-spa10ac336mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 7.25 Round Plain Hole Plain Acetal (SPA10AC337.25MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-7-25-round-plain-hole-plain-acetal-turbo-smart-rm-eb2-spa10ac337-25mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 7.25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Special Notes:** TURBO SMART # RM-EB2 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 7.5 Round Plain Hole Plain Acetal (SPA10AC337.5MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-7-5-round-plain-hole-plain-acetal-spa10ac337-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 7 Round Plain Hole Plain Acetal (SPA10AC337MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-7-round-plain-hole-plain-acetal-spa10ac337mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 7 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 8 Round Plain Hole Plain Acetal (SPA10AC338MM#)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-8-round-plain-hole-plain-acetal-spa10ac338mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.3 X 9 Round Plain Hole Plain Acetal (SPA10AC339MM)](https://psmfasteners.com/product/spacers-and-standoffs-m3-3-x-9-round-plain-hole-plain-acetal-spa10ac339mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 5A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 9 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.3 **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.5 X 10 Round Plain Hole Plain Acetal 6.4OD (SPA10AC3510MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m3-5-x-10-round-plain-hole-plain-acetal-6-4od-spa10ac3510mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.5 **Product Special Notes:** 6.4OD **Product Thread:** METRIC --- ### [Spacers & Standoffs M3.5 X 25 Round Plain Hole Plain Acetal 6.4OD (SPA10AC3525MMSP)](https://psmfasteners.com/product/spacers-and-standoffs-m3-5-x-25-round-plain-hole-plain-acetal-6-4od-spa10ac3525mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 10 Round Plain Hole Acetal Spacers & Standoffs - Acetal Spacers & Standoffs with through holes - Light weight - Good thermal stability. **Content:** [ ![Diagram of SPA 10 Round Plain Hole Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers.avif) #### Advantages > Spacers with through holes > Light weight > Good thermal stability for Acetal #### Materials Available AC – Acetal B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) ## Dimensions ![SPA 10 Round Plain Hole Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-dimensions.avif) ![SPA 10 Round Plain Hole Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-10-spacers-lengths-1.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Plain Hole Spacers **Product Product Type 3:** Plain **Product Size:** 3.5 **Product Special Notes:** 6.4OD **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 58 Round Female / Female Acetal 6MM Body (SPA04ACM358SPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-58-round-female-female-acetal-6mm-body-spa04acm358spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 58 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Special Notes:** 6MM BODY **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 5 Round Female / Female Acetal (SPA04ACM35MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-5-round-female-female-acetal-spa04acm35mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 6 Round Female / Female Acetal (SPA04ACM36MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-6-round-female-female-acetal-spa04acm36mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 7.4 Round Female / Female Acetal (SPA04ACM37.4MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-7-4-round-female-female-acetal-spa04acm37-4mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 7.4 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 8 Round Female / Female Acetal (SPA04ACM38MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-8-round-female-female-acetal-spa04acm38mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 8 Round Female / Female Acetal 4.92 OD (SPA04ACM38MMSP)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-8-round-female-female-acetal-4-92-od-spa04acm38mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Special Notes:** 4.92 OD **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 9 Round Female / Female Acetal (SPA04ACM39MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-9-round-female-female-acetal-spa04acm39mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 9 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 9 Round Female / Female Acetal O.D.8MM (SPA04ACM39MMSPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-9-round-female-female-acetal-o-d-8mm-spa04acm39mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 9 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Special Notes:** O.D.8MM **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 10 Round Female / Female Acetal (SPA04ACM410MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-10-round-female-female-acetal-spa04acm410mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 12 Round Female / Female Acetal (SPA04ACM412MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-12-round-female-female-acetal-spa04acm412mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 14 Round Female / Female Nylon (SPA04ACM414MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-14-round-female-female-nylon-spa04acm414mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 16 Round Female / Female Acetal (SPA04ACM416MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-16-round-female-female-acetal-spa04acm416mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 20 Round Female / Female Acetal (SPA04ACM420MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-20-round-female-female-acetal-spa04acm420mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 25 Round Female / Female Acetal (SPA04ACM425MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-25-round-female-female-acetal-spa04acm425mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 30 Round Female / Female Acetal (SPA04ACM430MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-30-round-female-female-acetal-spa04acm430mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 35 Round Female / Female Acetal (SPA04ACM435MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-35-round-female-female-acetal-spa04acm435mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 36 Round Female / Female Acetal (SPA04ACM436MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-36-round-female-female-acetal-spa04acm436mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F5 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 36 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 40 Round Female / Female Acetal (SPA04ACM440MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-40-round-female-female-acetal-spa04acm440mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 45 Round Female / Female Acetal (SPA04ACM445MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-45-round-female-female-acetal-spa04acm445mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 51 Round Female / Female Acetal (SPA04ACM451MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-51-round-female-female-acetal-spa04acm451mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 51 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 53 Round Female / Female Acetal (SPA04ACM453MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-53-round-female-female-acetal-spa04acm453mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 53 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 55 Round Female / Female Acetal (SPA04ACM455MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-55-round-female-female-acetal-spa04acm455mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F5 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 55 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 5 Round Female / Female Acetal (SPA04ACM45MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-5-round-female-female-acetal-spa04acm45mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 60 Round Female / Female Acetal (SPA04ACM460MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-60-round-female-female-acetal-spa04acm460mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F5 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 60 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 72 Round Female / Female Acetal Delrin Threaded Spacers & Standoffs M(MIN 10MM THREAD) (SPA04ACM472MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-72-round-female-female-acetal-delrin-threaded-spacers-and-standoffs-mmin-10mm-thread-spa04acm472mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F5 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 72 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Special Notes:** DELRIN SPACER (MIN 10MM THREAD) **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 12 Round Female / Female Nylon 12MM OD (SPA04ACM512MMSP)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-12-round-female-female-nylon-12mm-od-spa04acm512mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Nylon **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 5 **Product Special Notes:** 12MM OD **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 18 Round Female / Female Acetal (SPA04ACM518MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-18-round-female-female-acetal-spa04acm518mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 18 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 30 Round Female / Female Acetal (SPA04ACM530MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-30-round-female-female-acetal-spa04acm530mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F5 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 42 Round Female / Female Acetal To DRW TPS9004 FEM - 13 MM (SPA04ACM542MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-42-round-female-female-acetal-to-drw-tps9004-fem-13-mm-spa04acm542mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 38A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 42 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 5 **Product Special Notes:** TO DRW TPS9004 FEM - 13 MM **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 45 Round Female / Female Acetal (SPA04ACM545MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-45-round-female-female-acetal-spa04acm545mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 70 Round Female / Female Acetal To DRW TPS9004 FEM-13MM (SPA04ACM570MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-70-round-female-female-acetal-to-drw-tps9004-fem-13mm-spa04acm570mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 38A1 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 70 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 5 **Product Special Notes:** TO DRW TPS9004 FEM-13MM **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 50 Round Female / Female Acetal (SPA04ACM650MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-50-round-female-female-acetal-spa04acm650mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 50 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 6 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 15 Round Female / Female Acetal (SPA04SM415MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-15-round-female-female-acetal-spa04sm415mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 15 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Spacers & Standoffs M10 X 45 Round Male / Female Acetal W 5.5 Plain Hole To DRW (SPA05ACM1045SP)](https://psmfasteners.com/product/spacers-and-standoffs-m10-x-45-round-male-female-acetal-w-5-5-plain-hole-to-drw-spa05acm1045sp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 10 **Product Special Notes:** W 5.5 PLAIN HOLE TO DRW **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2 X 12 Round Male / Female Acetal (SPA05ACM212MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-x-12-round-male-female-acetal-spa05acm212mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F6 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 2 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 10 Round Male / Female Acetal (SPA05ACM310MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-10-round-male-female-acetal-spa05acm310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 12 Round Male / Female Acetal (SPA05ACM312MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-12-round-male-female-acetal-spa05acm312mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F6 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 13 Round Male / Female Acetal (SPA05ACM313MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-13-round-male-female-acetal-spa05acm313mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F6 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 13 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 14.9 Round Male / Female Acetal (SPA05ACM314.9MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-14-9-round-male-female-acetal-spa05acm314-9mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14.9 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 14 Round Male / Female Acetal (SPA05ACM314MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-14-round-male-female-acetal-spa05acm314mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 15 Round Male / Female Acetal (SPA05ACM315MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-15-round-male-female-acetal-spa05acm315mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 15 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 16 Round Male / Female Acetal (SPA05ACM316MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-16-round-male-female-acetal-spa05acm316mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F6 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 18 Round Male / Female Acetal (SPA05ACM318MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-18-round-male-female-acetal-spa05acm318mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F6 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 18 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 20 Round Male / Female Acetal (SPA05ACM320MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-20-round-male-female-acetal-spa05acm320mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 22 Round Male / Female Acetal THD 8MM Long (SPA05ACM322MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-22-round-male-female-acetal-thd-8mm-long-spa05acm322mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 22 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Special Notes:** THD 8MM LONG **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 25 Round Male / Female Acetal (SPA05ACM325MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-25-round-male-female-acetal-spa05acm325mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F6 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 30 Round Male / Female Acetal (SPA05ACM330MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-30-round-male-female-acetal-spa05acm330mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F6 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 32 Round Male / Female Acetal 8MM Male (SPA05ACM332SPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-32-round-male-female-acetal-8mm-male-spa05acm332spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 32 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Special Notes:** 8MM MALE **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 40 Round Male / Female Acetal (SPA05ACM340MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-40-round-male-female-acetal-spa05acm340mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F6 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 40 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 45 Round Male / Female Acetal (SPA05ACM345MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-45-round-male-female-acetal-spa05acm345mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 5 Round Male / Female Acetal (SPA05ACM35MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-5-round-male-female-acetal-spa05acm35mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 6 Round Male / Female Acetal (SPA05ACM36MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-6-round-male-female-acetal-spa05acm36mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F5 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 8 Round Male / Female Acetal (SPA05ACM38MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-8-round-male-female-acetal-spa05acm38mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 9.5 Round Male / Female Acetal (SPA05ACM39.5MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-9-5-round-male-female-acetal-spa05acm39-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 9.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 9 Round Male / Female Acetal (SPA05ACM39MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-9-round-male-female-acetal-spa05acm39mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 9 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 10 Round Male / Female Acetal (SPA05ACM410MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-10-round-male-female-acetal-spa05acm410mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 10 Round Male / Female Acetal Acetal/Male/Blank Space (SPA05ACM410MMSP)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-10-round-male-female-acetal-acetal-male-blank-space-spa05acm410mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Special Notes:** ACETAL/MALE/BLANK SPACE **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 14 Round Male / Female Acetal (SPA05ACM414MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-14-round-male-female-acetal-spa05acm414mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 16 Round Male / Female Acetal (SPA05ACM416MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-16-round-male-female-acetal-spa05acm416mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 20 Round Male / Female Acetal (SPA05ACM420MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-20-round-male-female-acetal-spa05acm420mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F7 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 25 Round Male / Female Acetal (SPA05ACM425MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-25-round-male-female-acetal-spa05acm425mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F7 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 30 Round Male / Female Acetal (SPA05ACM430MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-30-round-male-female-acetal-spa05acm430mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F7 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 35 Round Male / Female Acetal (SPA05ACM435MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-35-round-male-female-acetal-spa05acm435mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 40 Round Male / Female Acetal (SPA05ACM440MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-40-round-male-female-acetal-spa05acm440mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F7 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 6 Round Male / Female Acetal (SPA05ACM46MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-6-round-male-female-acetal-spa05acm46mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F7 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 8 Round Male / Female Acetal (SPA05ACM48MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-8-round-male-female-acetal-spa05acm48mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F7 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 100 Round Male / Female Acetal (SPA05ACM5100MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-100-round-male-female-acetal-spa05acm5100mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 38A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 100 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 45 Round Male / Female Acetal (SPA05ACM545MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-45-round-male-female-acetal-spa05acm545mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 50 Round Male / Female Acetal (SPA05ACM550MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-50-round-male-female-acetal-spa05acm550mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 38A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 50 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 60 Round Male / Female Acetal (SPA05ACM560MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-60-round-male-female-acetal-spa05acm560mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 38A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 60 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 80 Round Male / Female Acetal (SPA05ACM580MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-80-round-male-female-acetal-spa05acm580mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 38A1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 80 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 40 Round Male / Female Acetal (SPA05ACM640MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-40-round-male-female-acetal-spa05acm640mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F7 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Male / Female **Product Size:** 6 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 8 Hex Male / Female Stainless Steel RAF M2103-3005-Ss (SPA02SSM38MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-8-hex-male-female-stainless-steel-raf-m2103-3005-ss-spa02ssm38mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 3 **Product Special Notes:** RAF M2103-3005-SS **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 14 Hex Male / Female Stainless Steel (SPA02SSM414MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-14-hex-male-female-stainless-steel-spa02ssm414mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 14 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 30 Hex Male / Female Stainless Steel (SPA02SSM430MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-30-hex-male-female-stainless-steel-spa02ssm430mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 35 Hex Male / Female Stainless Steel (SPA02SSM435MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-35-hex-male-female-stainless-steel-spa02ssm435mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 40 Hex Male / Female Stainless Steel (SPA02SSM440MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-40-hex-male-female-stainless-steel-spa02ssm440mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 8 Hex Male / Female Stainless Steel (SPA02SSM48MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-8-hex-male-female-stainless-steel-spa02ssm48mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 45 Hex Male / Female Stainless Steel (SPA02SSM545MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-45-hex-male-female-stainless-steel-spa02ssm545mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 8 Hex Male / Female Stainless Steel (SPA02SSM58MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-8-hex-male-female-stainless-steel-spa02ssm58mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 170000000 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 10 Hex Male / Female Stainless Steel To DRW M2265-6010-Ss (SPA02SSM610MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-10-hex-male-female-stainless-steel-to-drw-m2265-6010-ss-spa02ssm610mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 6 **Product Special Notes:** TO DRW M2265-6010-SS **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 12 Hex Male / Female Stainless Steel (SPA02SSM612MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-12-hex-male-female-stainless-steel-spa02ssm612mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 6 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 45 Hex Male / Female Stainless Steel AF10.0MM (SPA02SSM645MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-45-hex-male-female-stainless-steel-af10-0mm-spa02ssm645mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 6 **Product Special Notes:** AF10.0MM **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2.5 X 5 Hex Male / Male Brass Nickel Plated (SPA03BM2.5-5MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-5-hex-male-male-brass-nickel-plated-spa03bm2-5-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2.5 X 8 Hex Male / Male Brass Nickel Plated (SPA03BM2.58MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-8-hex-male-male-brass-nickel-plated-spa03bm2-58mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs Mx Hex Male / Male Brass Nickel Plated (SPA03BM3/M4*57)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-mx-hex-male-male-brass-nickel-plated-spa03bm3-m4x57/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 10 Hex Male / Male Brass Nickel Plated (SPA03BM310MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-10-hex-male-male-brass-nickel-plated-spa03bm310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 1700000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 20 Hex Male / Male Brass Nickel Plated (SPA03BM320MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-20-hex-male-male-brass-nickel-plated-spa03bm320mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 1700000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 45 Hex Male / Male Brass Nickel Plated (SPA03BM345MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-45-hex-male-male-brass-nickel-plated-spa03bm345mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 1700000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 45 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 53 Hex Male / Male Brass Nickel Plated (SPA03BM353MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-53-hex-male-male-brass-nickel-plated-spa03bm353mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 1700000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 53 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 55 Hex Male / Male Brass Nickel Plated (SPA03BM355MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-55-hex-male-male-brass-nickel-plated-spa03bm355mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 55 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 57 Hex Male / Male Brass Nickel Plated M3(5MM LONG)M4(5MM LONG) (SPA03BM357MMSPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-57-hex-male-male-brass-nickel-plated-m35mm-longm45mm-long-spa03bm357mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 57 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Special Notes:** M3(5MM LONG)M4(5MM LONG) **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 5 Hex Male / Male Brass Nickel Plated 8MM Male Spec Thread Req (SPA03BM35MM-08)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-5-hex-male-male-brass-nickel-plated-8mm-male-spec-thread-req-spa03bm35mm-08/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 1700000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 5 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Special Notes:** 8MM MALE SPEC THREAD REQ **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 5 Hex Male / Male Brass Nickel Plated 10MM Male Both Ends (SPA03BM35MMSPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-5-hex-male-male-brass-nickel-plated-10mm-male-both-ends-spa03bm35mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Special Notes:** 10MM MALE BOTH ENDS **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 75 Hex Male / Male Brass Nickel Plated M3(5MM LONG)M4(5MM LONG) (SPA03BM375MMSPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-75-hex-male-male-brass-nickel-plated-m35mm-longm45mm-long-spa03bm375mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 75 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Special Notes:** M3(5MM LONG)M4(5MM LONG) **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 8 Hex Male / Male Brass Nickel Plated (SPA03BM38MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-8-hex-male-male-brass-nickel-plated-spa03bm38mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 35 Hex Male / Male Brass Nickel Plated (SPA03BM435MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-35-hex-male-male-brass-nickel-plated-spa03bm435mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 35 Hex Male / Male Brass Nickel Plated Stud L=8Mm/10MM (SPA03BM435MMSP)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-35-hex-male-male-brass-nickel-plated-stud-l-8mm-10mm-spa03bm435mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Special Notes:** STUD L=8MM/10MM **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 55 Hex Male / Male Brass Nickel Plated (SPA03BM455MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-55-hex-male-male-brass-nickel-plated-spa03bm455mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 1700000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 55 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 5 Hex Male / Male Brass Nickel Plated (SPA03BM45MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-5-hex-male-male-brass-nickel-plated-spa03bm45mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 8 Hex Male / Male Brass Nickel Plated (SPA03BM48MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-8-hex-male-male-brass-nickel-plated-spa03bm48mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 1700000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 30 Hex Male / Male Brass Nickel Plated (SPA03BM530MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-30-hex-male-male-brass-nickel-plated-spa03bm530mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 50 Hex Male / Male Brass Nickel Plated (SPA03BM650MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-50-hex-male-male-brass-nickel-plated-spa03bm650mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 50 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 6 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2.5 X 5 Hex Male / Male Steel Yellow Zinc Plated To Dwg M4015 (SPA03SM2.55MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-5-hex-male-male-steel-yellow-zinc-plated-to-dwg-m4015-spa03sm2-55mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 2.5 **Product Special Notes:** TO DWG M4015 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2.5 X 5 Hex Male / Male Steel Yellow Zinc Plated DRW-M4616 (SPA03SM2.55MMSP)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-5-hex-male-male-steel-yellow-zinc-plated-drw-m4616-spa03sm2-55mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Yellow Zinc Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 2.5 **Product Special Notes:** DRW-M4616 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 5 Hex Male / Male Steel (SPA03SM35MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-5-hex-male-male-steel-spa03sm35mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 5 Hex Male / Male Steel (SPA03SM45MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-5-hex-male-male-steel-spa03sm45mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 30 Hex Male / Male Steel (SPA03SM530MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-30-hex-male-male-steel-spa03sm530mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 35 Hex Male / Male Steel (SPA03SM535MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-35-hex-male-male-steel-spa03sm535mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 5 Hex Male / Male Stainless Steel 8MM Male Both Ends (SPA03SSM35MMSPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-5-hex-male-male-stainless-steel-8mm-male-both-ends-spa03ssm35mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 5 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 3 **Product Special Notes:** 8MM MALE BOTH ENDS **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 20 Hex Male / Male Stainless Steel (SPA03SSM620MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-20-hex-male-male-stainless-steel-spa03ssm620mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 6 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 25 Hex Male / Male Stainless Steel (SPA03SSM625MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-25-hex-male-male-stainless-steel-spa03ssm625mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 6 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 40 Hex Male / Male Stainless Steel (SPA03SSM640MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-40-hex-male-male-stainless-steel-spa03ssm640mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 6 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M6 X 30 Hex Male / Male Stainless Steel (SPA03SSM6X30MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m6-x-30-hex-male-male-stainless-steel-spa03ssm6x30mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Stainless Steel **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Male **Product Size:** 6 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs 10.32UNF X 12 Round Female / Female Acetal (SPA04AC1032NF12)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-10-32unf-x-12-round-female-female-acetal-spa04ac1032nf12/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 10.32 **Product Thread:** UNF --- ### [Threaded Spacers & Standoffs M2.5 X 10 Round Female / Female Acetal (SPA04ACM2.510MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-10-round-female-female-acetal-spa04acm2-510mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2.5 X 11.1 Round Female / Female Acetal (SPA04ACM2.511.1)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-11-1-round-female-female-acetal-spa04acm2-511-1/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 11.1 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2.5 X 16 Round Female / Female Acetal (SPA04ACM2.516MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-16-round-female-female-acetal-spa04acm2-516mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2.5 X 17 Round Female / Female Acetal (SPA04ACM2.517MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-17-round-female-female-acetal-spa04acm2-517mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 17 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2.5 X 8 Round Female / Female Acetal (SPA04ACM2.58MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-5-x-8-round-female-female-acetal-spa04acm2-58mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2.5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2 X 10 Round Female / Female Acetal (SPA04ACM210MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-x-10-round-female-female-acetal-spa04acm210mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2 X 12 Round Female / Female Acetal (SPA04ACM212MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-x-12-round-female-female-acetal-spa04acm212mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2 X 16 Round Female / Female Acetal (SPA04ACM216MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-x-16-round-female-female-acetal-spa04acm216mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2 X 20 Round Female / Female Acetal (SPA04ACM220MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-x-20-round-female-female-acetal-spa04acm220mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2 X 6.7 Round Female / Female Acetal (SPA04ACM26.7MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-x-6-7-round-female-female-acetal-spa04acm26-7mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6.7 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2 X 6 Round Female / Female Acetal (SPA04ACM26MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-x-6-round-female-female-acetal-spa04acm26mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M2 X 8 Round Female / Female Acetal (SPA04ACM28MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m2-x-8-round-female-female-acetal-spa04acm28mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 2 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 10 Round Female / Female Acetal (SPA04ACM310MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-10-round-female-female-acetal-spa04acm310mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 11 Round Female / Female Acetal (SPA04ACM311MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-11-round-female-female-acetal-spa04acm311mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 11 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 12.5 Round Female / Female Acetal (SPA04ACM312.5MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-12-5-round-female-female-acetal-spa04acm312-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 12 Round Female / Female Acetal (SPA04ACM312MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-12-round-female-female-acetal-spa04acm312mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 13.5 Round Female / Female Acetal (SPA04ACM313.5MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-13-5-round-female-female-acetal-spa04acm313-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 13.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 13 Round Female / Female Acetal (SPA04ACM313MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-13-round-female-female-acetal-spa04acm313mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 13 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 14 Round Female / Female Acetal (SPA04ACM314MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-14-round-female-female-acetal-spa04acm314mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F2 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 14 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 15 Round Female / Female Acetal M3(6.5MM DEEP) M2(5MM DEEP) (SPA04ACM315MMSP)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-15-round-female-female-acetal-m36-5mm-deep-m25mm-deep-spa04acm315mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 15 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Special Notes:** M3(6.5MM DEEP) M2(5MM DEEP) **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 16 Round Female / Female Acetal (SPA04ACM316MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-16-round-female-female-acetal-spa04acm316mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F3 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 16 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 17.6 Round Female / Female Acetal (SPA04ACM317.6MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-17-6-round-female-female-acetal-spa04acm317-6mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F3 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 17.6 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 18 Round Female / Female Acetal (SPA04ACM318MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-18-round-female-female-acetal-spa04acm318mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F3 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 18 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 19 Round Female / Female Acetal (SPA04ACM319MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-19-round-female-female-acetal-spa04acm319mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F3 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 19 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 19 Round Female / Female Acetal X 6.35 (SPA04ACM319MSPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-19-round-female-female-acetal-x-6-35-spa04acm319mspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F3 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 19 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Special Notes:** X 6.35 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 20 Round Female / Female Acetal (SPA04ACM320MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-20-round-female-female-acetal-spa04acm320mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 22.5 Round Female / Female Acetal (SPA04ACM322.5MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-22-5-round-female-female-acetal-spa04acm322-5mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 22.5 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 22 Round Female / Female Acetal (SPA04ACM322MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-22-round-female-female-acetal-spa04acm322mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 22 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 23.8 Round Female / Female Acetal (SPA04ACM323.8MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-23-8-round-female-female-acetal-spa04acm323-8mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 23.8 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 23 Round Female / Female Acetal (SPA04ACM323MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-23-round-female-female-acetal-spa04acm323mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 23 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 25 Round Female / Female Acetal (SPA04ACM325MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-25-round-female-female-acetal-spa04acm325mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F3 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 25 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 30 Round Female / Female Acetal (SPA04ACM330MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-30-round-female-female-acetal-spa04acm330mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F3 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 30 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 35 Round Female / Female Acetal (SPA04ACM335MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-35-round-female-female-acetal-spa04acm335mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F3 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 35 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 36.2 Round Female / Female Acetal (SPA04ACM336.2MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-36-2-round-female-female-acetal-spa04acm336-2mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F1 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 36.2 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 38 Round Female / Female Acetal (SPA04ACM338MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-38-round-female-female-acetal-spa04acm338mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 38 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 40 Round Female / Female Acetal (SPA04ACM340MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-40-round-female-female-acetal-spa04acm340mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 45 Round Female / Female Acetal (SPA04ACM345MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-45-round-female-female-acetal-spa04acm345mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 45 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M3 X 50 Round Female / Female Acetal 6MM Body (SPA04ACM350SPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m3-x-50-round-female-female-acetal-6mm-body-spa04acm350spe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 04/05/06 Round Acetal Spacers & Standoffs - High electrical insulation ? Lightweight - High strength plastic - Good thermal stability. **Content:** ![Diagram showing SPA 04/05/06 Round Acetal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers.avif) #### Advantages > High electrical insulation > Lightweight > High strength plastic > Good thermal stability #### Materials Available AC-Acetal ## Dimensions ![Table showing SPA 04 Round Acetal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-dimensions.avif) ![Table showing SPA 04 Round Acetal Spacer lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-04-hex-spacers-length.avif) **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars, Uncategorized **Product Bin Location:** 17F4 **Product Default Location:** PSM **Product Lead Time:** Same Day **Product Length/Dimension:** 50 **Product Material:** Acetal **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Round Acetal Spacers **Product Product Type 3:** Female / Female **Product Size:** 3 **Product Special Notes:** 6MM BODY **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 55 Hex Male / Female Brass Nickel Plated (SPA02BM455MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-55-hex-male-female-brass-nickel-plated-spa02bm455mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 55 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 60 Hex Male / Female Brass Nickel Plated (SPA02BM460MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-60-hex-male-female-brass-nickel-plated-spa02bm460mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 60 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 67 Hex Male / Female Brass Nickel Plated (SPA02BM467MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-67-hex-male-female-brass-nickel-plated-spa02bm467mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 67 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 6 Hex Male / Female Brass Nickel Plated (SPA02BM46MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-6-hex-male-female-brass-nickel-plated-spa02bm46mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 6 Hex Male / Female Brass Nickel Plated Hawk Special Male=6.00MM (SPA02BM46MMSPE)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-6-hex-male-female-brass-nickel-plated-hawk-special-male-6-00mm-spa02bm46mmspe/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 6 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Special Notes:** HAWK SPECIAL MALE=6.00MM **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 6 Hex Male / Female Brass Nickel Plated Male - 10MM (SPA02BM46SPE10)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-6-hex-male-female-brass-nickel-plated-male-10mm-spa02bm46spe10/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Special Notes:** MALE - 10MM **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 6 Hex Male / Female Brass Nickel Plated Male=12.0MM (SPA02BM46SPE12)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-6-hex-male-female-brass-nickel-plated-male-12-0mm-spa02bm46spe12/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 17000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 6 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Special Notes:** MALE=12.0MM **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 8 Hex Male / Female Brass Nickel Plated (SPA02BM48MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-8-hex-male-female-brass-nickel-plated-spa02bm48mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 170000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 8 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 9 Hex Male / Female Brass Nickel Plated (SPA02BM49MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-9-hex-male-female-brass-nickel-plated-spa02bm49mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 170000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 9 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 9 Hex Male / Female Brass Nickel Plated 12MM Male Thread (SPA02BM49MMSP)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-9-hex-male-female-brass-nickel-plated-12mm-male-thread-spa02bm49mmsp/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 9 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Special Notes:** 12MM MALE THREAD **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M4 X 35 Hex Male / Female Brass Nickel Plated 4MM Male (SPA02BM4X35-4#)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-35-hex-male-female-brass-nickel-plated-4mm-male-spa02bm4x35-4/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 35 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 4 **Product Special Notes:** 4MM MALE **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 10 Hex Male / Female Brass Nickel Plated (SPA02BM510MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-10-hex-male-female-brass-nickel-plated-spa02bm510mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 170000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** Same Day **Product Length/Dimension:** 10 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 12 Hex Male / Female Brass Nickel Plated (SPA02BM512MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-12-hex-male-female-brass-nickel-plated-spa02bm512mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 12 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 20 Hex Male / Female Brass Nickel Plated (SPA02BM520MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-20-hex-male-female-brass-nickel-plated-spa02bm520mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Bin Location:** 170000000 **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 20 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 25 Hex Male / Female Brass Nickel Plated (SPA02BM525MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-25-hex-male-female-brass-nickel-plated-spa02bm525mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 25 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 30 Hex Male / Female Brass Nickel Plated (SPA02BM530MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-30-hex-male-female-brass-nickel-plated-spa02bm530mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 30 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 36 Hex Male / Female Brass Nickel Plated (SPA02BM536MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-36-hex-male-female-brass-nickel-plated-spa02bm536mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 36 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 40 Hex Male / Female Brass Nickel Plated (SPA02BM540MM)](https://psmfasteners.com/product/threaded-spacers-and-standoffs-m5-x-40-hex-male-female-brass-nickel-plated-spa02bm540mm/) **Published:** May 9, 2025 **Author:** PSM Fasteners **Excerpt:** SPA 01/02/03 Hexagonal Spacers & Standoffs - Easily attached - Suitable for high temperature applications - High strength - Precision re-useable threads. **Content:** [ ![Diagram showing SPA 01/02/03 Hexagonal Spacers](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) ](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers.avif) #### Advantages > Easily attached > Suitable for high temperature applications > High strength > Precision reusable threads #### Materials Available B – Brass (electro nickel plated) SS – Stainless steel 18/8 MS – Mild Steel (zinc plated) AC – Acetal ## Dimensions ![SPA 01/02/03 Hexagonal Spacer dimensions](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-dimensions-e1754027428943.avif) ![SPA 01/02/03 Hexagonal Spacer Lengths](https://psmfasteners.com/wp-content/uploads/2025/08/spa-01-hex-spacers-length-e1754028042568.avif) ## Design & Material Options Hexagonal spacers in the SPA-01/02/03 family are offered in a variety of materials including brass, stainless steel, and mild steel (zinc plated). Each variant uses standardized hex flats to allow wrench tightening or hand assembly. The reusable threads are engineered for strength and long life even in repeated assembly cycles. The hex shape helps resist rotation during tightening and provides convenient handling. ## Dimensional & Thread Details These spacers come in metric and unified thread sizes (e.g. M2 up to M6 or ¼-UNC). The hex flats (across-flat dimension) and outer dimensions are matched with thread size to give consistent strength and wrenching capability. Spacer lengths typically range from a few millimeters up to 60 mm (or more by special order). Standard tolerances ensure interchangeability and consistent performance. ## Installation & Usage Recommendations #### **Alignment & Tightening** Because these are threaded spacers, they must be aligned squarely between mating parts before tightening to avoid cross-threading or side stresses. Use appropriate torque and wrenching on the hex flats to avoid damaging threads. #### **Material Compatibility & Environment** Choose the material that matches or complements adjoining components. For example, stainless hex spacers are ideal in corrosive or humid environments. Brass variants provide good conductivity and corrosion resistance for electrical or mixed assemblies. #### **Thermal & Mechanical Stability** In assemblies exposed to vibration, thermal cycling, or mechanical loading, SPA-hex spacers maintain separation and alignment. The hex shape helps resist rotational forces during torqueing, and the material ensures durability under load. **Brands:** PSM **Product categories:** Threaded Spacers & Support Pillars **Product Default Location:** PSM **Product Finish:** Nickel Plated **Product Lead Time:** 7-8 Weeks **Product Length/Dimension:** 40 **Product Material:** Brass **Product Product Type 1:** Threaded Spacers & Support Pillars **Product Product Type 2:** Hexagonal Spacers **Product Product Type 3:** Male / Female **Product Size:** 5 **Product Thread:** METRIC --- ### [Threaded Spacers & Standoffs M5 X 50 Hex Male / Female Brass Nickel Plated (SPA02BM55